Planting zones by state
Illinois Planting Zones
Illinois runs from zone 5a to zone 7a on the 2023 USDA map. Zone 6a is the most common, covering 42% of the state's ZIP codes. Chicago is 6a, Springfield is 6a and Carbondale is 7a.
Zones across Illinois
| Zone | Average coldest night | Share of Illinois ZIP codes |
|---|---|---|
| 5a | −20 to −15°F | 2% |
| 5b | −15 to −10°F | 29% |
| 6a | −10 to −5°F | 42% |
| 6b | −5 to 0°F | 17% |
| 7a | 0 to 5°F | 11% |
Planting zone for every city and town in Illinois
Each Illinois town uses the ZIP code at its center. Big towns can cross into the next half-zone, so look up your own ZIP if you're near a line.
| City | Zone | Average coldest night |
|---|---|---|
| Abingdon | 5b | −15 to −10°F |
| Addieville | 6b | −5 to 0°F |
| Addison | 6a | −10 to −5°F |
| Adeline | 5b | −15 to −10°F |
| Albany | 5b | −15 to −10°F |
| Albers | 6b | −5 to 0°F |
| Albion | 6b | −5 to 0°F |
| Aledo | 5b | −15 to −10°F |
| Alexis | 5b | −15 to −10°F |
| Algonquin | 5b | −15 to −10°F |
| Alhambra | 6b | −5 to 0°F |
| Allendale | 6b | −5 to 0°F |
| Allenville | 6a | −10 to −5°F |
| Allerton | 6a | −10 to −5°F |
| Alma | 6b | −5 to 0°F |
| Alpha | 5b | −15 to −10°F |
| Alsey | 6a | −10 to −5°F |
| Alsip | 6a | −10 to −5°F |
| Altamont | 6b | −5 to 0°F |
| Alto Pass | 7a | 0 to 5°F |
| Alton | 7a | 0 to 5°F |
| Altona | 5b | −15 to −10°F |
| Alvan (Alvin) | 6a | −10 to −5°F |
| Amboy | 5b | −15 to −10°F |
| Anchor | 6a | −10 to −5°F |
| Andalusia | 5b | −15 to −10°F |
| Andover | 5b | −15 to −10°F |
| Anna | 7a | 0 to 5°F |
| Annawan | 5b | −15 to −10°F |
| Antioch | 5b | −15 to −10°F |
| Apple River | 5a | −20 to −15°F |
| Arcola | 6a | −10 to −5°F |
| Arenzville | 6a | −10 to −5°F |
| Argenta | 6a | −10 to −5°F |
| Arlington | 5b | −15 to −10°F |
| Arlington Heights | 6a | −10 to −5°F |
| Armington | 6a | −10 to −5°F |
| Aroma Park | 5b | −15 to −10°F |
| Arrowsmith | 6a | −10 to −5°F |
| Arthur | 6a | −10 to −5°F |
| Ashkum | 5b | −15 to −10°F |
| Ashland | 6a | −10 to −5°F |
| Ashley | 6b | −5 to 0°F |
| Ashmore | 6a | −10 to −5°F |
| Ashton | 5b | −15 to −10°F |
| Assumption | 6a | −10 to −5°F |
| Astoria | 6a | −10 to −5°F |
| Athens | 6a | −10 to −5°F |
| Atkinson | 5b | −15 to −10°F |
| Atlanta | 6a | −10 to −5°F |
| Atwood | 6a | −10 to −5°F |
| Auburn | 6a | −10 to −5°F |
| Augusta | 6a | −10 to −5°F |
| Aurora | 5b | −15 to −10°F |
| Ava | 7a | 0 to 5°F |
| Aviston | 6b | −5 to 0°F |
| Avon | 5b | −15 to −10°F |
| Baldwin | 7a | 0 to 5°F |
| Banner | 6a | −10 to −5°F |
| Bannockburn | 6a | −10 to −5°F |
| Bardolph | 6a | −10 to −5°F |
| Barrington | 5b | −15 to −10°F |
| Barrington Hills | 5b | −15 to −10°F |
| Barry | 6a | −10 to −5°F |
| Bartelso | 6b | −5 to 0°F |
| Bartlett | 5b | −15 to −10°F |
| Bartonville | 6a | −10 to −5°F |
| Basco | 6a | −10 to −5°F |
| Batavia | 5b | −15 to −10°F |
| Batchtown | 6b | −5 to 0°F |
| Bath | 6a | −10 to −5°F |
| Bay View Gardens | 6a | −10 to −5°F |
| Baylis | 6a | −10 to −5°F |
| Beach Park | 6a | −10 to −5°F |
| Beardstown | 6a | −10 to −5°F |
| Beaverville | 5b | −15 to −10°F |
| Beckemeyer | 6b | −5 to 0°F |
| Bedford Park | 6a | −10 to −5°F |
| Beecher | 6a | −10 to −5°F |
| Beecher City | 6b | −5 to 0°F |
| Belgium | 6a | −10 to −5°F |
| Belknap | 7a | 0 to 5°F |
| Belle Prairie City | 6b | −5 to 0°F |
| Belle Rive | 6b | −5 to 0°F |
| Belleville | 7a | 0 to 5°F |
| Bellevue | 6a | −10 to −5°F |
| Bellflower | 6a | −10 to −5°F |
| Bellmont | 6b | −5 to 0°F |
| Bellwood | 6a | −10 to −5°F |
| Belvidere | 5b | −15 to −10°F |
| Bement | 6a | −10 to −5°F |
| Benld | 6b | −5 to 0°F |
| Bensenville | 6a | −10 to −5°F |
| Benson | 5b | −15 to −10°F |
| Bentley | 6a | −10 to −5°F |
| Benton | 7a | 0 to 5°F |
| Berkeley | 6a | −10 to −5°F |
| Berlin | 6a | −10 to −5°F |
| Berwyn | 6a | −10 to −5°F |
| Bethalto | 6b | −5 to 0°F |
| Bethany | 6a | −10 to −5°F |
| Big Rock | 5b | −15 to −10°F |
| Biggsville | 5b | −15 to −10°F |
| Bingham | 6b | −5 to 0°F |
| Bishop Hill | 5b | −15 to −10°F |
| Bismarck | 6a | −10 to −5°F |
| Blandinsville | 6a | −10 to −5°F |
| Bloomingdale | 5b | −15 to −10°F |
| Bloomington | 6a | −10 to −5°F |
| Blue Island | 6a | −10 to −5°F |
| Blue Mound | 6a | −10 to −5°F |
| Bluffs | 6a | −10 to −5°F |
| Bluford | 6b | −5 to 0°F |
| Bolingbrook | 6a | −10 to −5°F |
| Bone Gap | 6b | −5 to 0°F |
| Bonfield | 5b | −15 to −10°F |
| Bonnie | 6b | −5 to 0°F |
| Bourbonnais | 5b | −15 to −10°F |
| Bowen | 6a | −10 to −5°F |
| Braceville | 5b | −15 to −10°F |
| Bradford | 5b | −15 to −10°F |
| Bradley | 5b | −15 to −10°F |
| Braidwood | 5b | −15 to −10°F |
| Breese | 6b | −5 to 0°F |
| Bridgeport | 6b | −5 to 0°F |
| Bridgeview | 6a | −10 to −5°F |
| Brighton | 6b | −5 to 0°F |
| Brimfield | 5b | −15 to −10°F |
| Broadlands | 6a | −10 to −5°F |
| Broadview | 6a | −10 to −5°F |
| Broadwell | 6a | −10 to −5°F |
| Brocton | 6a | −10 to −5°F |
| Brookfield | 6a | −10 to −5°F |
| Brooklyn | 7a | 0 to 5°F |
| Brookport | 7a | 0 to 5°F |
| Broughton | 7a | 0 to 5°F |
| Browning | 6a | −10 to −5°F |
| Browns | 6b | −5 to 0°F |
| Brownstown | 6b | −5 to 0°F |
| Brussels | 6b | −5 to 0°F |
| Bryant | 6a | −10 to −5°F |
| Buckingham | 5b | −15 to −10°F |
| Buckley | 6a | −10 to −5°F |
| Buckner | 7a | 0 to 5°F |
| Buda | 5b | −15 to −10°F |
| Buffalo | 6a | −10 to −5°F |
| Buffalo Grove | 6a | −10 to −5°F |
| Bull Valley | 5b | −15 to −10°F |
| Bulpitt | 6a | −10 to −5°F |
| Buncombe | 7a | 0 to 5°F |
| Bunker Hill | 6b | −5 to 0°F |
| Burbank | 6a | −10 to −5°F |
| Bureau Junction | 5b | −15 to −10°F |
| Burlington | 5b | −15 to −10°F |
| Burnham | 6a | −10 to −5°F |
| Burnt Prairie | 6b | −5 to 0°F |
| Burr Ridge | 6a | −10 to −5°F |
| Bush | 7a | 0 to 5°F |
| Bushnell | 6a | −10 to −5°F |
| Butler | 6b | −5 to 0°F |
| Byron | 5b | −15 to −10°F |
| Cabery | 5b | −15 to −10°F |
| Cahokia Heights | 7a | 0 to 5°F |
| Cairo | 7a | 0 to 5°F |
| Caledonia | 5b | −15 to −10°F |
| Calhoun | 6b | −5 to 0°F |
| Calumet City | 6a | −10 to −5°F |
| Calumet Park | 6a | −10 to −5°F |
| Camargo | 6a | −10 to −5°F |
| Cambria | 7a | 0 to 5°F |
| Cambridge | 5b | −15 to −10°F |
| Camden | 6a | −10 to −5°F |
| Camp Point | 6a | −10 to −5°F |
| Campbell Hill | 7a | 0 to 5°F |
| Campton Hills | 5b | −15 to −10°F |
| Campus | 5b | −15 to −10°F |
| Canton | 6a | −10 to −5°F |
| Cantrall | 6a | −10 to −5°F |
| Capron | 5b | −15 to −10°F |
| Carbon Cliff | 5b | −15 to −10°F |
| Carbon Hill | 5b | −15 to −10°F |
| Carbondale | 7a | 0 to 5°F |
| Carlinville | 6b | −5 to 0°F |
| Carlock | 5b | −15 to −10°F |
| Carlyle | 6b | −5 to 0°F |
| Carmi | 7a | 0 to 5°F |
| Carol Stream | 5b | −15 to −10°F |
| Carpentersville | 5b | −15 to −10°F |
| Carrier Mills | 7a | 0 to 5°F |
| Carrollton | 6a | −10 to −5°F |
| Carterville | 7a | 0 to 5°F |
| Carthage | 6a | −10 to −5°F |
| Cary | 5b | −15 to −10°F |
| Casey | 6b | −5 to 0°F |
| Caseyville | 7a | 0 to 5°F |
| Catlin | 6a | −10 to −5°F |
| Cave-In-Rock | 7a | 0 to 5°F |
| Cedar Point | 5b | −15 to −10°F |
| Cedarville | 5a | −20 to −15°F |
| Central City | 6b | −5 to 0°F |
| Centralia | 6b | −5 to 0°F |
| Cerro Gordo | 6a | −10 to −5°F |
| Chadwick | 5a | −20 to −15°F |
| Champaign | 6a | −10 to −5°F |
| Chandlerville | 6a | −10 to −5°F |
| Channahon | 5b | −15 to −10°F |
| Chapin | 6a | −10 to −5°F |
| Charleston | 6a | −10 to −5°F |
| Chatham | 6a | −10 to −5°F |
| Chatsworth | 6a | −10 to −5°F |
| Chebanse | 5b | −15 to −10°F |
| Chenoa | 5b | −15 to −10°F |
| Cherry | 5b | −15 to −10°F |
| Cherry Valley | 5b | −15 to −10°F |
| Chester | 7a | 0 to 5°F |
| Chesterfield | 6b | −5 to 0°F |
| Chicago | 6a | −10 to −5°F |
| Chicago Heights | 6a | −10 to −5°F |
| Chicago Ridge | 6a | −10 to −5°F |
| Chillicothe | 6a | −10 to −5°F |
| Chrisman | 6a | −10 to −5°F |
| Christopher | 7a | 0 to 5°F |
| Cicero | 6a | −10 to −5°F |
| Cisco | 6a | −10 to −5°F |
| Cisne | 6b | −5 to 0°F |
| Cissna Park | 6a | −10 to −5°F |
| Claremont | 6b | −5 to 0°F |
| Clarendon Hills | 6a | −10 to −5°F |
| Clay City | 6b | −5 to 0°F |
| Clayton | 6a | −10 to −5°F |
| Cleveland | 5b | −15 to −10°F |
| Clifton | 5b | −15 to −10°F |
| Clinton | 6a | −10 to −5°F |
| Coal City | 5b | −15 to −10°F |
| Coal Valley | 5b | −15 to −10°F |
| Coalton | 6a | −10 to −5°F |
| Coatsburg | 6a | −10 to −5°F |
| Cobden | 7a | 0 to 5°F |
| Coffeen | 6b | −5 to 0°F |
| Colchester | 6a | −10 to −5°F |
| Coleta | 5b | −15 to −10°F |
| Colfax | 6a | −10 to −5°F |
| Collinsville | 7a | 0 to 5°F |
| Colona | 5b | −15 to −10°F |
| Colp | 7a | 0 to 5°F |
| Columbia | 7a | 0 to 5°F |
| Columbus | 6a | −10 to −5°F |
| Compton | 5b | −15 to −10°F |
| Concord | 6a | −10 to −5°F |
| Congerville | 5b | −15 to −10°F |
| Cooksville | 6a | −10 to −5°F |
| Cordova | 5b | −15 to −10°F |
| Cornell | 5b | −15 to −10°F |
| Cortland | 5b | −15 to −10°F |
| Coulterville | 6b | −5 to 0°F |
| Country Club Hills | 6a | −10 to −5°F |
| Countryside | 6a | −10 to −5°F |
| Cowden | 6b | −5 to 0°F |
| Crainville | 7a | 0 to 5°F |
| Creal Springs | 7a | 0 to 5°F |
| Crescent City | 5b | −15 to −10°F |
| Crest Hill | 6a | −10 to −5°F |
| Creston | 5b | −15 to −10°F |
| Crestwood | 6a | −10 to −5°F |
| Crete | 6a | −10 to −5°F |
| Creve Coeur | 6a | −10 to −5°F |
| Crossville | 7a | 0 to 5°F |
| Crystal Lake | 5b | −15 to −10°F |
| Cuba | 6a | −10 to −5°F |
| Cullom | 5b | −15 to −10°F |
| Curran | 6a | −10 to −5°F |
| Cutler | 7a | 0 to 5°F |
| Cypress | 7a | 0 to 5°F |
| Dahlgren | 6b | −5 to 0°F |
| Dakota | 5a | −20 to −15°F |
| Dallas City | 6a | −10 to −5°F |
| Dalton City | 6a | −10 to −5°F |
| Dalzell | 5b | −15 to −10°F |
| Damiansville | 6b | −5 to 0°F |
| Dana | 5b | −15 to −10°F |
| Danforth | 5b | −15 to −10°F |
| Danvers | 5b | −15 to −10°F |
| Danville | 6a | −10 to −5°F |
| Darien | 6a | −10 to −5°F |
| Davis | 5a | −20 to −15°F |
| Davis Junction | 5b | −15 to −10°F |
| Dawson | 6a | −10 to −5°F |
| De Land | 6a | −10 to −5°F |
| De Pue | 5b | −15 to −10°F |
| De Soto | 7a | 0 to 5°F |
| De Witt | 6a | −10 to −5°F |
| Decatur | 6a | −10 to −5°F |
| Deer Creek | 5b | −15 to −10°F |
| Deer Grove | 5b | −15 to −10°F |
| Deer Park | 5b | −15 to −10°F |
| Deerfield | 6a | −10 to −5°F |
| DeKalb | 5b | −15 to −10°F |
| Delavan | 6a | −10 to −5°F |
| Des Plaines | 6a | −10 to −5°F |
| Detroit | 6a | −10 to −5°F |
| Diamond | 5b | −15 to −10°F |
| Dieterich | 6b | −5 to 0°F |
| Divernon | 6a | −10 to −5°F |
| Dix | 6b | −5 to 0°F |
| Dixmoor | 6a | −10 to −5°F |
| Dixon | 5b | −15 to −10°F |
| Dolton | 6a | −10 to −5°F |
| Dongola | 7a | 0 to 5°F |
| Donnellson | 6b | −5 to 0°F |
| Donovan | 5b | −15 to −10°F |
| Dorchester | 6b | −5 to 0°F |
| Dowell | 7a | 0 to 5°F |
| Downers Grove | 6a | −10 to −5°F |
| Downs | 6a | −10 to −5°F |
| Du Bois | 6b | −5 to 0°F |
| Du Quoin | 7a | 0 to 5°F |
| Dunfermline | 6a | −10 to −5°F |
| Dunlap | 5b | −15 to −10°F |
| Dupo | 7a | 0 to 5°F |
| Durand | 5b | −15 to −10°F |
| Dwight | 5b | −15 to −10°F |
| Eagarville | 6b | −5 to 0°F |
| Earlville | 5b | −15 to −10°F |
| East Alton | 7a | 0 to 5°F |
| East Brooklyn | 5b | −15 to −10°F |
| East Cape Girardeau | 7a | 0 to 5°F |
| East Carondelet | 7a | 0 to 5°F |
| East Dubuque | 5a | −20 to −15°F |
| East Dundee | 5b | −15 to −10°F |
| East Galesburg | 5b | −15 to −10°F |
| East Gillespie | 6b | −5 to 0°F |
| East Hazel Crest | 6a | −10 to −5°F |
| East Moline | 5b | −15 to −10°F |
| East Peoria | 6a | −10 to −5°F |
| East St. Louis | 7a | 0 to 5°F |
| Easton | 6a | −10 to −5°F |
| Eddyville | 7a | 0 to 5°F |
| Edgewood | 6b | −5 to 0°F |
| Edinburg | 6a | −10 to −5°F |
| Edwardsville | 7a | 0 to 5°F |
| Effingham | 6b | −5 to 0°F |
| El Dara | 6b | −5 to 0°F |
| El Paso | 5b | −15 to −10°F |
| Elburn | 5b | −15 to −10°F |
| Eldorado | 7a | 0 to 5°F |
| Eldred | 6b | −5 to 0°F |
| Elgin | 5b | −15 to −10°F |
| Elizabeth | 5a | −20 to −15°F |
| Elk Grove Village | 6a | −10 to −5°F |
| Elkhart | 6a | −10 to −5°F |
| Elkville | 7a | 0 to 5°F |
| Elliott | 6a | −10 to −5°F |
| Ellis Grove | 7a | 0 to 5°F |
| Ellisville | 6a | −10 to −5°F |
| Ellsworth | 6a | −10 to −5°F |
| Elmhurst | 6a | −10 to −5°F |
| Elmwood | 5b | −15 to −10°F |
| Elmwood Park | 6a | −10 to −5°F |
| Elsah | 6b | −5 to 0°F |
| Elvaston | 6a | −10 to −5°F |
| Elwood | 6a | −10 to −5°F |
| Emden | 6a | −10 to −5°F |
| Emington | 5b | −15 to −10°F |
| Energy | 7a | 0 to 5°F |
| Enfield | 6b | −5 to 0°F |
| Equality | 7a | 0 to 5°F |
| Erie | 5b | −15 to −10°F |
| Essex | 5b | −15 to −10°F |
| Eureka | 5b | −15 to −10°F |
| Evanston | 6a | −10 to −5°F |
| Evansville | 7a | 0 to 5°F |
| Evergreen Park | 6a | −10 to −5°F |
| Ewing | 6b | −5 to 0°F |
| Exeter | 6a | −10 to −5°F |
| Fairbury | 6a | −10 to −5°F |
| Fairfield | 6b | −5 to 0°F |
| Fairmont City | 7a | 0 to 5°F |
| Fairmount | 6a | −10 to −5°F |
| Fairview | 5b | −15 to −10°F |
| Fairview Heights | 7a | 0 to 5°F |
| Farina | 6b | −5 to 0°F |
| Farmer City | 6a | −10 to −5°F |
| Farmersville | 6a | −10 to −5°F |
| Farmington | 5b | −15 to −10°F |
| Fayetteville | 6b | −5 to 0°F |
| Ferris | 6a | −10 to −5°F |
| Fieldon | 6b | −5 to 0°F |
| Fillmore | 6b | −5 to 0°F |
| Findlay | 6a | −10 to −5°F |
| Fisher | 6a | −10 to −5°F |
| Fithian | 6a | −10 to −5°F |
| Flanagan | 5b | −15 to −10°F |
| Flat Rock | 6b | −5 to 0°F |
| Flora | 6b | −5 to 0°F |
| Florence | 6a | −10 to −5°F |
| Flossmoor | 6a | −10 to −5°F |
| Foosland | 6a | −10 to −5°F |
| Ford Heights | 6a | −10 to −5°F |
| Forest City | 6a | −10 to −5°F |
| Forest Park | 6a | −10 to −5°F |
| Forest View | 6a | −10 to −5°F |
| Forrest | 6a | −10 to −5°F |
| Forreston | 5b | −15 to −10°F |
| Forsyth | 6a | −10 to −5°F |
| Fox Lake | 5b | −15 to −10°F |
| Fox River Grove | 5b | −15 to −10°F |
| Frankfort | 6a | −10 to −5°F |
| Franklin | 6a | −10 to −5°F |
| Franklin Grove | 5b | −15 to −10°F |
| Franklin Park | 6a | −10 to −5°F |
| Freeburg | 7a | 0 to 5°F |
| Freeman Spur | 7a | 0 to 5°F |
| Freeport | 5a | −20 to −15°F |
| Fulton | 5b | −15 to −10°F |
| Fults | 7a | 0 to 5°F |
| Galatia | 7a | 0 to 5°F |
| Galena | 5a | −20 to −15°F |
| Galesburg | 5b | −15 to −10°F |
| Galva | 5b | −15 to −10°F |
| Gardner | 5b | −15 to −10°F |
| Garrett | 6a | −10 to −5°F |
| Gays | 6a | −10 to −5°F |
| Geneseo | 5b | −15 to −10°F |
| Geneva | 5b | −15 to −10°F |
| Genoa | 5b | −15 to −10°F |
| Georgetown | 6a | −10 to −5°F |
| German Valley | 5b | −15 to −10°F |
| Germantown | 6b | −5 to 0°F |
| Germantown Hills | 6a | −10 to −5°F |
| Gibson City | 6a | −10 to −5°F |
| Gifford | 6a | −10 to −5°F |
| Gilberts | 5b | −15 to −10°F |
| Gillespie | 6b | −5 to 0°F |
| Gilman | 5b | −15 to −10°F |
| Girard | 6b | −5 to 0°F |
| Gladstone | 6a | −10 to −5°F |
| Glasford | 6a | −10 to −5°F |
| Glasgow | 6a | −10 to −5°F |
| Glen Carbon | 7a | 0 to 5°F |
| Glen Ellyn | 5b | −15 to −10°F |
| Glencoe | 6a | −10 to −5°F |
| Glendale Heights | 5b | −15 to −10°F |
| Glenview | 6a | −10 to −5°F |
| Glenwood | 6a | −10 to −5°F |
| Godfrey | 6b | −5 to 0°F |
| Godley | 5b | −15 to −10°F |
| Golconda | 7a | 0 to 5°F |
| Golden | 6a | −10 to −5°F |
| Golden Gate | 6b | −5 to 0°F |
| Golf | 6a | −10 to −5°F |
| Good Hope | 5b | −15 to −10°F |
| Goodfield | 5b | −15 to −10°F |
| Goreville | 7a | 0 to 5°F |
| Gorham | 7a | 0 to 5°F |
| Grafton | 6b | −5 to 0°F |
| Grand Ridge | 5b | −15 to −10°F |
| Grand Tower | 7a | 0 to 5°F |
| Grandview | 6a | −10 to −5°F |
| Granite City | 7a | 0 to 5°F |
| Grant Park | 5b | −15 to −10°F |
| Grantfork | 6b | −5 to 0°F |
| Granville | 5b | −15 to −10°F |
| Grayslake | 5b | −15 to −10°F |
| Grayville | 7a | 0 to 5°F |
| Green Oaks | 6a | −10 to −5°F |
| Green Valley | 6a | −10 to −5°F |
| Greenfield | 6a | −10 to −5°F |
| Greenup | 6b | −5 to 0°F |
| Greenview | 6a | −10 to −5°F |
| Greenville | 6b | −5 to 0°F |
| Greenwood | 5b | −15 to −10°F |
| Gridley | 5b | −15 to −10°F |
| Griggsville | 6a | −10 to −5°F |
| Gulfport | 6a | −10 to −5°F |
| Gurnee | 6a | −10 to −5°F |
| Hainesville | 5b | −15 to −10°F |
| Hamburg | 6a | −10 to −5°F |
| Hamel | 6b | −5 to 0°F |
| Hamilton | 6a | −10 to −5°F |
| Hammond | 6a | −10 to −5°F |
| Hampshire | 5b | −15 to −10°F |
| Hampton | 5b | −15 to −10°F |
| Hanaford | 6b | −5 to 0°F |
| Hanna City | 6a | −10 to −5°F |
| Hanover | 5a | −20 to −15°F |
| Hanover Park | 5b | −15 to −10°F |
| Hardin | 6b | −5 to 0°F |
| Harmon | 5b | −15 to −10°F |
| Harrisburg | 7a | 0 to 5°F |
| Harristown | 6a | −10 to −5°F |
| Hartford | 7a | 0 to 5°F |
| Hartsburg | 6a | −10 to −5°F |
| Harvard | 5b | −15 to −10°F |
| Harvel | 6a | −10 to −5°F |
| Harvey | 6a | −10 to −5°F |
| Harwood Heights | 6a | −10 to −5°F |
| Havana | 6a | −10 to −5°F |
| Hawthorn Woods | 5b | −15 to −10°F |
| Hazel Crest | 6a | −10 to −5°F |
| Hebron | 5b | −15 to −10°F |
| Hecker | 7a | 0 to 5°F |
| Henderson | 5b | −15 to −10°F |
| Hennepin | 5b | −15 to −10°F |
| Henning | 6a | −10 to −5°F |
| Henry | 5b | −15 to −10°F |
| Herrick | 6b | −5 to 0°F |
| Herrin | 7a | 0 to 5°F |
| Herscher | 5b | −15 to −10°F |
| Hettick | 6a | −10 to −5°F |
| Heyworth | 6a | −10 to −5°F |
| Hickory Hills | 6a | −10 to −5°F |
| Hidalgo | 6b | −5 to 0°F |
| Highland | 6b | −5 to 0°F |
| Highland Park | 6a | −10 to −5°F |
| Highwood | 6a | −10 to −5°F |
| Hillcrest | 5b | −15 to −10°F |
| Hillsboro | 6b | −5 to 0°F |
| Hillsdale | 5b | −15 to −10°F |
| Hillside | 6a | −10 to −5°F |
| Hillview | 6b | −5 to 0°F |
| Hinckley | 5b | −15 to −10°F |
| Hindsboro | 6a | −10 to −5°F |
| Hinsdale | 6a | −10 to −5°F |
| Hodgkins | 6a | −10 to −5°F |
| Hoffman | 6b | −5 to 0°F |
| Hoffman Estates | 5b | −15 to −10°F |
| Holiday Hills | 5b | −15 to −10°F |
| Hollowayville | 5b | −15 to −10°F |
| Homer | 6a | −10 to −5°F |
| Homer Glen | 6a | −10 to −5°F |
| Hometown | 6a | −10 to −5°F |
| Homewood | 6a | −10 to −5°F |
| Hoopeston | 6a | −10 to −5°F |
| Hooppole | 5b | −15 to −10°F |
| Hopedale | 6a | −10 to −5°F |
| Hopewell | 5b | −15 to −10°F |
| Hopkins Park | 5b | −15 to −10°F |
| Hoyleton | 6b | −5 to 0°F |
| Hudson | 6a | −10 to −5°F |
| Huey | 6b | −5 to 0°F |
| Hull | 6b | −5 to 0°F |
| Humboldt | 6a | −10 to −5°F |
| Hume | 6a | −10 to −5°F |
| Huntley | 5b | −15 to −10°F |
| Hurst | 7a | 0 to 5°F |
| Hutsonville | 6b | −5 to 0°F |
| Illiopolis | 6a | −10 to −5°F |
| Ina | 6b | −5 to 0°F |
| Indian Creek | 6a | −10 to −5°F |
| Indian Head Park | 6a | −10 to −5°F |
| Indianola | 6a | −10 to −5°F |
| Industry | 6a | −10 to −5°F |
| Inverness | 5b | −15 to −10°F |
| Iola | 6b | −5 to 0°F |
| Ipava | 6a | −10 to −5°F |
| Iroquois | 5b | −15 to −10°F |
| Irving | 6b | −5 to 0°F |
| Irvington | 6b | −5 to 0°F |
| Irwin | 5b | −15 to −10°F |
| Island Lake | 5b | −15 to −10°F |
| Itasca | 6a | −10 to −5°F |
| Iuka | 6b | −5 to 0°F |
| Ivesdale | 6a | −10 to −5°F |
| Jacksonville | 6a | −10 to −5°F |
| Jeffersonville | 6b | −5 to 0°F |
| Jeisyville | 6a | −10 to −5°F |
| Jerome | 6a | −10 to −5°F |
| Jerseyville | 6b | −5 to 0°F |
| Jewett | 6b | −5 to 0°F |
| Johnsburg | 5b | −15 to −10°F |
| Johnsonville | 6b | −5 to 0°F |
| Johnston City | 7a | 0 to 5°F |
| Joliet | 5b | −15 to −10°F |
| Jonesboro | 7a | 0 to 5°F |
| Joppa | 7a | 0 to 5°F |
| Joy | 5b | −15 to −10°F |
| Junction | 7a | 0 to 5°F |
| Junction City | 6b | −5 to 0°F |
| Justice | 6a | −10 to −5°F |
| Kampsville | 6a | −10 to −5°F |
| Kane | 6b | −5 to 0°F |
| Kaneville | 5b | −15 to −10°F |
| Kangley | 5b | −15 to −10°F |
| Kankakee | 5b | −15 to −10°F |
| Kansas | 6a | −10 to −5°F |
| Kappa | 6a | −10 to −5°F |
| Karnak | 7a | 0 to 5°F |
| Kaskaskia | 7a | 0 to 5°F |
| Keenes | 6b | −5 to 0°F |
| Keensburg | 6b | −5 to 0°F |
| Keithsburg | 5b | −15 to −10°F |
| Kell | 6b | −5 to 0°F |
| Kempton | 5b | −15 to −10°F |
| Kenilworth | 6a | −10 to −5°F |
| Kenney | 6a | −10 to −5°F |
| Kewanee | 5b | −15 to −10°F |
| Keyesport | 6b | −5 to 0°F |
| Kilbourne | 6a | −10 to −5°F |
| Kildeer | 5b | −15 to −10°F |
| Kincaid | 6a | −10 to −5°F |
| Kinderhook | 6a | −10 to −5°F |
| Kingston | 5b | −15 to −10°F |
| Kingston Mines | 6a | −10 to −5°F |
| Kinmundy | 6b | −5 to 0°F |
| Kinsman | 5b | −15 to −10°F |
| Kirkland | 5b | −15 to −10°F |
| Kirkwood | 5b | −15 to −10°F |
| Knoxville | 5b | −15 to −10°F |
| La Fayette | 5b | −15 to −10°F |
| La Grange | 6a | −10 to −5°F |
| La Grange Park | 6a | −10 to −5°F |
| La Harpe | 6a | −10 to −5°F |
| La Moille | 5b | −15 to −10°F |
| La Prairie | 6a | −10 to −5°F |
| La Rose | 5b | −15 to −10°F |
| Lacon | 5b | −15 to −10°F |
| Ladd | 5b | −15 to −10°F |
| Lake Barrington | 5b | −15 to −10°F |
| Lake Bluff | 6a | −10 to −5°F |
| Lake Forest | 6a | −10 to −5°F |
| Lake in the Hills | 5b | −15 to −10°F |
| Lake Ka-Ho | 6b | −5 to 0°F |
| Lake Villa | 5b | −15 to −10°F |
| Lake Zurich | 5b | −15 to −10°F |
| Lakemoor | 5b | −15 to −10°F |
| Lakewood | 5b | −15 to −10°F |
| Lanark | 5a | −20 to −15°F |
| Lansing | 6a | −10 to −5°F |
| LaSalle | 5b | −15 to −10°F |
| Latham | 6a | −10 to −5°F |
| Lawrenceville | 6b | −5 to 0°F |
| Le Roy | 6a | −10 to −5°F |
| Leaf River | 5b | −15 to −10°F |
| Lebanon | 6b | −5 to 0°F |
| Lee | 5b | −15 to −10°F |
| Leland | 5b | −15 to −10°F |
| Leland Grove | 6a | −10 to −5°F |
| Lemont | 6a | −10 to −5°F |
| Lena | 5a | −20 to −15°F |
| Lenzburg | 6b | −5 to 0°F |
| Leonore | 5b | −15 to −10°F |
| Lerna | 6a | −10 to −5°F |
| Lewistown | 6a | −10 to −5°F |
| Lexington | 6a | −10 to −5°F |
| Liberty | 6a | −10 to −5°F |
| Libertyville | 6a | −10 to −5°F |
| Lily Lake | 5b | −15 to −10°F |
| Lima | 6a | −10 to −5°F |
| Limestone | 5b | −15 to −10°F |
| Lincoln | 6a | −10 to −5°F |
| Lincolnshire | 6a | −10 to −5°F |
| Lincolnwood | 6a | −10 to −5°F |
| Lindenhurst | 5b | −15 to −10°F |
| Lisbon | 5b | −15 to −10°F |
| Lisle | 5b | −15 to −10°F |
| Litchfield | 6b | −5 to 0°F |
| Little York | 5b | −15 to −10°F |
| Littleton | 6a | −10 to −5°F |
| Liverpool | 6a | −10 to −5°F |
| Livingston | 6b | −5 to 0°F |
| Loami | 6a | −10 to −5°F |
| Lockport | 6a | −10 to −5°F |
| Loda | 6a | −10 to −5°F |
| Lomax | 6a | −10 to −5°F |
| Lombard | 6a | −10 to −5°F |
| London Mills | 5b | −15 to −10°F |
| Long Creek | 6a | −10 to −5°F |
| Long Grove | 5b | −15 to −10°F |
| Long Point | 5b | −15 to −10°F |
| Longview | 6a | −10 to −5°F |
| Loraine | 6a | −10 to −5°F |
| Lostant | 5b | −15 to −10°F |
| Louisville | 6b | −5 to 0°F |
| Loves Park | 5b | −15 to −10°F |
| Lovington | 6a | −10 to −5°F |
| Ludlow | 6a | −10 to −5°F |
| Lyndon | 5b | −15 to −10°F |
| Lynnville | 6a | −10 to −5°F |
| Lynwood | 6a | −10 to −5°F |
| Lyons | 6a | −10 to −5°F |
| Macedonia | 6b | −5 to 0°F |
| Machesney Park | 5b | −15 to −10°F |
| Mackinaw | 6a | −10 to −5°F |
| Macomb | 6a | −10 to −5°F |
| Macon | 6a | −10 to −5°F |
| Madison | 7a | 0 to 5°F |
| Maeystown | 7a | 0 to 5°F |
| Magnolia | 5b | −15 to −10°F |
| Mahomet | 6a | −10 to −5°F |
| Makanda | 7a | 0 to 5°F |
| Malta | 5b | −15 to −10°F |
| Manchester | 6a | −10 to −5°F |
| Manhattan | 6a | −10 to −5°F |
| Manito | 6a | −10 to −5°F |
| Manlius | 5b | −15 to −10°F |
| Mansfield | 6a | −10 to −5°F |
| Manteno | 5b | −15 to −10°F |
| Maple Park | 5b | −15 to −10°F |
| Mapleton | 6a | −10 to −5°F |
| Maquon | 5b | −15 to −10°F |
| Marengo | 5b | −15 to −10°F |
| Marietta | 6a | −10 to −5°F |
| Marine | 6b | −5 to 0°F |
| Marion | 7a | 0 to 5°F |
| Marissa | 7a | 0 to 5°F |
| Mark | 5b | −15 to −10°F |
| Markham | 6a | −10 to −5°F |
| Maroa | 6a | −10 to −5°F |
| Marquette Heights | 6a | −10 to −5°F |
| Marseilles | 5b | −15 to −10°F |
| Marshall | 6a | −10 to −5°F |
| Martinsville | 6b | −5 to 0°F |
| Martinton | 5b | −15 to −10°F |
| Maryville | 7a | 0 to 5°F |
| Mascoutah | 6b | −5 to 0°F |
| Mason | 6b | −5 to 0°F |
| Mason City | 6a | −10 to −5°F |
| Matherville | 5b | −15 to −10°F |
| Matteson | 6a | −10 to −5°F |
| Mattoon | 6a | −10 to −5°F |
| Maunie | 7a | 0 to 5°F |
| Maywood | 6a | −10 to −5°F |
| Mazon | 5b | −15 to −10°F |
| McClure | 7a | 0 to 5°F |
| McCook | 6a | −10 to −5°F |
| McCullom Lake | 5b | −15 to −10°F |
| McHenry | 5b | −15 to −10°F |
| McLean | 6a | −10 to −5°F |
| McLeansboro | 6b | −5 to 0°F |
| McNabb | 5b | −15 to −10°F |
| Mechanicsburg | 6a | −10 to −5°F |
| Media | 5b | −15 to −10°F |
| Medora | 6b | −5 to 0°F |
| Melrose Park | 6a | −10 to −5°F |
| Melvin | 6a | −10 to −5°F |
| Mendon | 6a | −10 to −5°F |
| Mendota | 5b | −15 to −10°F |
| Menominee | 5a | −20 to −15°F |
| Meredosia | 6a | −10 to −5°F |
| Merrionette Park | 6a | −10 to −5°F |
| Metamora | 6a | −10 to −5°F |
| Metcalf | 6a | −10 to −5°F |
| Metropolis | 7a | 0 to 5°F |
| Mettawa | 6a | −10 to −5°F |
| Middletown | 6a | −10 to −5°F |
| Midlothian | 6a | −10 to −5°F |
| Milan | 5b | −15 to −10°F |
| Milford | 6a | −10 to −5°F |
| Mill Creek | 7a | 0 to 5°F |
| Mill Shoals | 6b | −5 to 0°F |
| Milledgeville | 5a | −20 to −15°F |
| Millington | 5b | −15 to −10°F |
| Millstadt | 7a | 0 to 5°F |
| Milton | 6a | −10 to −5°F |
| Mineral | 5b | −15 to −10°F |
| Minier | 6a | −10 to −5°F |
| Minonk | 5b | −15 to −10°F |
| Minooka | 5b | −15 to −10°F |
| Modesto | 6b | −5 to 0°F |
| Mokena | 6a | −10 to −5°F |
| Moline | 5b | −15 to −10°F |
| Momence | 5b | −15 to −10°F |
| Monee | 6a | −10 to −5°F |
| Monmouth | 5b | −15 to −10°F |
| Monroe Center | 5b | −15 to −10°F |
| Montgomery | 5b | −15 to −10°F |
| Monticello | 6a | −10 to −5°F |
| Montrose | 6b | −5 to 0°F |
| Morris | 5b | −15 to −10°F |
| Morrison | 5b | −15 to −10°F |
| Morrisonville | 6a | −10 to −5°F |
| Morton | 6a | −10 to −5°F |
| Morton Grove | 6a | −10 to −5°F |
| Mound City | 7a | 0 to 5°F |
| Mound Station | 6a | −10 to −5°F |
| Mounds | 7a | 0 to 5°F |
| Mount Auburn | 6a | −10 to −5°F |
| Mount Carmel | 6b | −5 to 0°F |
| Mount Carroll | 5a | −20 to −15°F |
| Mount Clare | 6b | −5 to 0°F |
| Mount Erie | 6b | −5 to 0°F |
| Mount Morris | 5b | −15 to −10°F |
| Mount Olive | 6b | −5 to 0°F |
| Mount Prospect | 6a | −10 to −5°F |
| Mount Pulaski | 6a | −10 to −5°F |
| Mount Sterling | 6a | −10 to −5°F |
| Mount Vernon | 6b | −5 to 0°F |
| Mount Zion | 6a | −10 to −5°F |
| Moweaqua | 6a | −10 to −5°F |
| Muddy | 7a | 0 to 5°F |
| Mulberry Grove | 6b | −5 to 0°F |
| Muncie | 6a | −10 to −5°F |
| Mundelein | 5b | −15 to −10°F |
| Murphysboro | 7a | 0 to 5°F |
| Murrayville | 6a | −10 to −5°F |
| Naperville | 5b | −15 to −10°F |
| Naplate | 5b | −15 to −10°F |
| Naples | 6a | −10 to −5°F |
| Nashville | 6b | −5 to 0°F |
| Nason | 6b | −5 to 0°F |
| Nauvoo | 6a | −10 to −5°F |
| Nebo | 6a | −10 to −5°F |
| Nelson | 5b | −15 to −10°F |
| Neoga | 6b | −5 to 0°F |
| Neponset | 5b | −15 to −10°F |
| New Athens | 7a | 0 to 5°F |
| New Baden | 6b | −5 to 0°F |
| New Bedford | 5b | −15 to −10°F |
| New Berlin | 6a | −10 to −5°F |
| New Boston | 5b | −15 to −10°F |
| New Burnside | 7a | 0 to 5°F |
| New Canton | 6b | −5 to 0°F |
| New Douglas | 6b | −5 to 0°F |
| New Grand Chain | 7a | 0 to 5°F |
| New Haven | 7a | 0 to 5°F |
| New Holland | 6a | −10 to −5°F |
| New Lenox | 6a | −10 to −5°F |
| New Milford | 5b | −15 to −10°F |
| New Minden | 6b | −5 to 0°F |
| New Salem | 6a | −10 to −5°F |
| Newark | 5b | −15 to −10°F |
| Newman | 6a | −10 to −5°F |
| Newton | 6b | −5 to 0°F |
| Niantic | 6a | −10 to −5°F |
| Niles | 6a | −10 to −5°F |
| Nilwood | 6b | −5 to 0°F |
| Noble | 6b | −5 to 0°F |
| Nokomis | 6a | −10 to −5°F |
| Nora | 5a | −20 to −15°F |
| Normal | 6a | −10 to −5°F |
| Norridge | 6a | −10 to −5°F |
| Norris | 5b | −15 to −10°F |
| Norris City | 7a | 0 to 5°F |
| North Aurora | 5b | −15 to −10°F |
| North Barrington | 5b | −15 to −10°F |
| North Chicago | 6a | −10 to −5°F |
| North City | 7a | 0 to 5°F |
| North Henderson | 5b | −15 to −10°F |
| North Pekin | 6a | −10 to −5°F |
| North Riverside | 6a | −10 to −5°F |
| North Utica | 5b | −15 to −10°F |
| Northbrook | 6a | −10 to −5°F |
| Northfield | 6a | −10 to −5°F |
| Northlake | 6a | −10 to −5°F |
| Norwood | 6a | −10 to −5°F |
| O'Fallon | 7a | 0 to 5°F |
| Oak Brook | 6a | −10 to −5°F |
| Oak Forest | 6a | −10 to −5°F |
| Oak Grove | 5b | −15 to −10°F |
| Oak Lawn | 6a | −10 to −5°F |
| Oakbrook Terrace | 6a | −10 to −5°F |
| Oakdale | 6b | −5 to 0°F |
| Oakford | 6a | −10 to −5°F |
| Oakland | 6a | −10 to −5°F |
| Oakwood | 6a | −10 to −5°F |
| Oakwood Hills | 5b | −15 to −10°F |
| Oblong | 6b | −5 to 0°F |
| Oconee | 6b | −5 to 0°F |
| Odell | 6a | −10 to −5°F |
| Odin | 6b | −5 to 0°F |
| Ogden | 6a | −10 to −5°F |
| Oglesby | 5b | −15 to −10°F |
| Ohio | 5b | −15 to −10°F |
| Ohlman | 6b | −5 to 0°F |
| Okawville | 6b | −5 to 0°F |
| Old Mill Creek | 5b | −15 to −10°F |
| Old Ripley | 6b | −5 to 0°F |
| Old Shawneetown | 7a | 0 to 5°F |
| Olmsted | 7a | 0 to 5°F |
| Olney | 6b | −5 to 0°F |
| Olympia Fields | 6a | −10 to −5°F |
| Omaha | 7a | 0 to 5°F |
| Onarga | 5b | −15 to −10°F |
| Oneida | 5b | −15 to −10°F |
| Oquawka | 5b | −15 to −10°F |
| Orangeville | 5a | −20 to −15°F |
| Oreana | 6a | −10 to −5°F |
| Oregon | 5b | −15 to −10°F |
| Orient | 7a | 0 to 5°F |
| Orion | 5b | −15 to −10°F |
| Orland Hills | 6a | −10 to −5°F |
| Orland Park | 6a | −10 to −5°F |
| Oswego | 5b | −15 to −10°F |
| Ottawa | 5b | −15 to −10°F |
| Otterville | 6b | −5 to 0°F |
| Owaneco | 6a | −10 to −5°F |
| Palatine | 5b | −15 to −10°F |
| Palestine | 6b | −5 to 0°F |
| Palmer | 6a | −10 to −5°F |
| Palmyra | 6b | −5 to 0°F |
| Palos Heights | 6a | −10 to −5°F |
| Palos Hills | 6a | −10 to −5°F |
| Palos Park | 6a | −10 to −5°F |
| Pana | 6b | −5 to 0°F |
| Panama | 6b | −5 to 0°F |
| Panola | 5b | −15 to −10°F |
| Papineau | 5b | −15 to −10°F |
| Paris | 6a | −10 to −5°F |
| Park City | 6a | −10 to −5°F |
| Park Forest | 6a | −10 to −5°F |
| Park Ridge | 6a | −10 to −5°F |
| Parkersburg | 6b | −5 to 0°F |
| Patoka | 6b | −5 to 0°F |
| Paw Paw | 5b | −15 to −10°F |
| Pawnee | 6a | −10 to −5°F |
| Paxton | 6a | −10 to −5°F |
| Payson | 6a | −10 to −5°F |
| Pearl | 6a | −10 to −5°F |
| Pearl City | 5a | −20 to −15°F |
| Pecatonica | 5b | −15 to −10°F |
| Pekin | 6a | −10 to −5°F |
| Peoria | 6a | −10 to −5°F |
| Peoria Heights | 6a | −10 to −5°F |
| Peotone | 6a | −10 to −5°F |
| Percy | 7a | 0 to 5°F |
| Perry | 6a | −10 to −5°F |
| Peru | 5b | −15 to −10°F |
| Pesotum | 6a | −10 to −5°F |
| Petersburg | 6a | −10 to −5°F |
| Phillipstown | 7a | 0 to 5°F |
| Philo | 6a | −10 to −5°F |
| Phoenix | 6a | −10 to −5°F |
| Pierron | 6b | −5 to 0°F |
| Pinckneyville | 7a | 0 to 5°F |
| Pingree Grove | 5b | −15 to −10°F |
| Piper City | 6a | −10 to −5°F |
| Pittsburg | 7a | 0 to 5°F |
| Pittsfield | 6a | −10 to −5°F |
| Plainfield | 5b | −15 to −10°F |
| Plainville | 6a | −10 to −5°F |
| Plano | 5b | −15 to −10°F |
| Plattville | 5b | −15 to −10°F |
| Pleasant Hill | 6b | −5 to 0°F |
| Pleasant Plains | 6a | −10 to −5°F |
| Plymouth | 6a | −10 to −5°F |
| Pocahontas | 6b | −5 to 0°F |
| Polo | 5b | −15 to −10°F |
| Pontiac | 6a | −10 to −5°F |
| Pontoon Beach | 7a | 0 to 5°F |
| Pontoosuc | 6a | −10 to −5°F |
| Poplar Grove | 5b | −15 to −10°F |
| Port Barrington | 5b | −15 to −10°F |
| Port Byron | 5b | −15 to −10°F |
| Posen | 6a | −10 to −5°F |
| Potomac | 6a | −10 to −5°F |
| Prairie City | 6a | −10 to −5°F |
| Prairie du Rocher | 7a | 0 to 5°F |
| Prairie Grove | 5b | −15 to −10°F |
| Princeton | 5b | −15 to −10°F |
| Princeville | 5b | −15 to −10°F |
| Prophetstown | 5b | −15 to −10°F |
| Prospect Heights | 6a | −10 to −5°F |
| Pulaski | 7a | 0 to 5°F |
| Quincy | 6a | −10 to −5°F |
| Radom | 6b | −5 to 0°F |
| Raleigh | 7a | 0 to 5°F |
| Ramsey | 6b | −5 to 0°F |
| Rankin | 6a | −10 to −5°F |
| Ransom | 5b | −15 to −10°F |
| Rantoul | 6a | −10 to −5°F |
| Rapids City | 5b | −15 to −10°F |
| Raymond | 6b | −5 to 0°F |
| Red Bud | 7a | 0 to 5°F |
| Reddick | 5b | −15 to −10°F |
| Redmon | 6a | −10 to −5°F |
| Reynolds | 5b | −15 to −10°F |
| Richmond | 5b | −15 to −10°F |
| Richton Park | 6a | −10 to −5°F |
| Richview | 6b | −5 to 0°F |
| Ridge Farm | 6a | −10 to −5°F |
| Ridgway | 7a | 0 to 5°F |
| Ridott | 5b | −15 to −10°F |
| Ringwood | 5b | −15 to −10°F |
| Rio | 5b | −15 to −10°F |
| Ripley | 6a | −10 to −5°F |
| River Forest | 6a | −10 to −5°F |
| River Grove | 6a | −10 to −5°F |
| Riverdale | 6a | −10 to −5°F |
| Riverside | 6a | −10 to −5°F |
| Riverton | 6a | −10 to −5°F |
| Riverwoods | 6a | −10 to −5°F |
| Roanoke | 5b | −15 to −10°F |
| Robbins | 6a | −10 to −5°F |
| Roberts | 6a | −10 to −5°F |
| Robinson | 6b | −5 to 0°F |
| Rochelle | 5b | −15 to −10°F |
| Rochester | 6a | −10 to −5°F |
| Rock City | 5a | −20 to −15°F |
| Rock Falls | 5b | −15 to −10°F |
| Rock Island | 5b | −15 to −10°F |
| Rockbridge | 6b | −5 to 0°F |
| Rockdale | 6a | −10 to −5°F |
| Rockford | 5b | −15 to −10°F |
| Rockton | 5b | −15 to −10°F |
| Rockwood | 7a | 0 to 5°F |
| Rolling Meadows | 6a | −10 to −5°F |
| Romeoville | 6a | −10 to −5°F |
| Roodhouse | 6a | −10 to −5°F |
| Roscoe | 5b | −15 to −10°F |
| Rose Hill | 6b | −5 to 0°F |
| Roselle | 5b | −15 to −10°F |
| Rosemont | 6a | −10 to −5°F |
| Roseville | 5b | −15 to −10°F |
| Rosiclare | 7a | 0 to 5°F |
| Rossville | 6a | −10 to −5°F |
| Round Lake | 5b | −15 to −10°F |
| Round Lake Beach | 5b | −15 to −10°F |
| Round Lake Heights | 5b | −15 to −10°F |
| Round Lake Park | 5b | −15 to −10°F |
| Roxana | 7a | 0 to 5°F |
| Royal | 6a | −10 to −5°F |
| Royal Lakes | 6b | −5 to 0°F |
| Royalton | 7a | 0 to 5°F |
| Ruma | 7a | 0 to 5°F |
| Rushville | 6a | −10 to −5°F |
| Russellville | 6b | −5 to 0°F |
| Rutland | 5b | −15 to −10°F |
| Sadorus | 6a | −10 to −5°F |
| Sailor Springs | 6b | −5 to 0°F |
| Salem | 6b | −5 to 0°F |
| Sammons Point | 5b | −15 to −10°F |
| San Jose | 6a | −10 to −5°F |
| Sandoval | 6b | −5 to 0°F |
| Sandwich | 5b | −15 to −10°F |
| Sauget | 7a | 0 to 5°F |
| Sauk Village | 6a | −10 to −5°F |
| Saunemin | 5b | −15 to −10°F |
| Savanna | 5a | −20 to −15°F |
| Savoy | 6a | −10 to −5°F |
| Sawyerville | 6b | −5 to 0°F |
| Saybrook | 6a | −10 to −5°F |
| Scales Mound | 5a | −20 to −15°F |
| Schaumburg | 5b | −15 to −10°F |
| Schiller Park | 6a | −10 to −5°F |
| Schram City | 6b | −5 to 0°F |
| Sciota | 5b | −15 to −10°F |
| Scottville | 6b | −5 to 0°F |
| Seaton | 5b | −15 to −10°F |
| Seatonville | 5b | −15 to −10°F |
| Secor | 5b | −15 to −10°F |
| Seneca | 5b | −15 to −10°F |
| Sesser | 6b | −5 to 0°F |
| Shabbona | 5b | −15 to −10°F |
| Shannon | 5a | −20 to −15°F |
| Shawneetown | 7a | 0 to 5°F |
| Sheffield | 5b | −15 to −10°F |
| Shelbyville | 6a | −10 to −5°F |
| Sheldon | 5b | −15 to −10°F |
| Sheridan | 5b | −15 to −10°F |
| Sherman | 6a | −10 to −5°F |
| Sherrard | 5b | −15 to −10°F |
| Shiloh | 7a | 0 to 5°F |
| Shipman | 6b | −5 to 0°F |
| Shorewood | 5b | −15 to −10°F |
| Shumway | 6b | −5 to 0°F |
| Sibley | 6a | −10 to −5°F |
| Sidell | 6a | −10 to −5°F |
| Sidney | 6a | −10 to −5°F |
| Sigel | 6b | −5 to 0°F |
| Silvis | 5b | −15 to −10°F |
| Simpson | 7a | 0 to 5°F |
| Sims | 6b | −5 to 0°F |
| Skokie | 6a | −10 to −5°F |
| Sleepy Hollow | 5b | −15 to −10°F |
| Smithboro | 6b | −5 to 0°F |
| Smithfield | 6a | −10 to −5°F |
| Smithton | 7a | 0 to 5°F |
| Somonauk | 5b | −15 to −10°F |
| Sorento | 6b | −5 to 0°F |
| South Barrington | 5b | −15 to −10°F |
| South Beloit | 5b | −15 to −10°F |
| South Chicago Heights | 6a | −10 to −5°F |
| South Elgin | 5b | −15 to −10°F |
| South Holland | 6a | −10 to −5°F |
| South Jacksonville | 6a | −10 to −5°F |
| South Pekin | 6a | −10 to −5°F |
| South Roxana | 7a | 0 to 5°F |
| South Wilmington | 5b | −15 to −10°F |
| Southern View | 6a | −10 to −5°F |
| Sparland | 5b | −15 to −10°F |
| Sparta | 7a | 0 to 5°F |
| Spaulding | 6a | −10 to −5°F |
| Spillertown | 7a | 0 to 5°F |
| Spring Bay | 6a | −10 to −5°F |
| Spring Grove | 5b | −15 to −10°F |
| Spring Valley | 5b | −15 to −10°F |
| Springerton | 7a | 0 to 5°F |
| Springfield | 6a | −10 to −5°F |
| St. Anne | 5b | −15 to −10°F |
| St. Augustine | 5b | −15 to −10°F |
| St. Charles | 5b | −15 to −10°F |
| St. David | 6a | −10 to −5°F |
| St. Elmo | 6b | −5 to 0°F |
| St. Francisville | 6b | −5 to 0°F |
| St. Jacob | 7a | 0 to 5°F |
| St. Johns | 7a | 0 to 5°F |
| St. Joseph | 6a | −10 to −5°F |
| St. Libory | 6b | −5 to 0°F |
| St. Peter | 6b | −5 to 0°F |
| St. Rose | 6b | −5 to 0°F |
| Standard City | 6b | −5 to 0°F |
| Stanford | 6a | −10 to −5°F |
| Staunton | 6b | −5 to 0°F |
| Ste. Marie | 6b | −5 to 0°F |
| Steeleville | 7a | 0 to 5°F |
| Steger | 6a | −10 to −5°F |
| Sterling | 5b | −15 to −10°F |
| Steward | 5b | −15 to −10°F |
| Stewardson | 6b | −5 to 0°F |
| Stickney | 6a | −10 to −5°F |
| Stillman Valley | 5b | −15 to −10°F |
| Stockton | 5a | −20 to −15°F |
| Stone Park | 6a | −10 to −5°F |
| Stonefort | 7a | 0 to 5°F |
| Stonington | 6a | −10 to −5°F |
| Stoy | 6b | −5 to 0°F |
| Strasburg | 6b | −5 to 0°F |
| Strawn | 6a | −10 to −5°F |
| Streamwood | 5b | −15 to −10°F |
| Streator | 5b | −15 to −10°F |
| Stronghurst | 6a | −10 to −5°F |
| Sublette | 5b | −15 to −10°F |
| Sugar Grove | 5b | −15 to −10°F |
| Sullivan | 6a | −10 to −5°F |
| Summerfield | 6b | −5 to 0°F |
| Summit | 6a | −10 to −5°F |
| Sumner | 6b | −5 to 0°F |
| Sun River Terrace | 5b | −15 to −10°F |
| Swansea | 7a | 0 to 5°F |
| Sycamore | 5b | −15 to −10°F |
| Symerton | 5b | −15 to −10°F |
| Table Grove | 6a | −10 to −5°F |
| Tallula | 6a | −10 to −5°F |
| Tamaroa | 6b | −5 to 0°F |
| Tamms | 7a | 0 to 5°F |
| Tampico | 5b | −15 to −10°F |
| Taylor Springs | 6b | −5 to 0°F |
| Taylorville | 6a | −10 to −5°F |
| Tennessee | 6a | −10 to −5°F |
| Teutopolis | 6b | −5 to 0°F |
| Thawville | 6a | −10 to −5°F |
| Thayer | 6a | −10 to −5°F |
| Thebes | 7a | 0 to 5°F |
| Third Lake | 5b | −15 to −10°F |
| Thomasboro | 6a | −10 to −5°F |
| Thompsonville | 6b | −5 to 0°F |
| Thomson | 5b | −15 to −10°F |
| Thornton | 6a | −10 to −5°F |
| Tilden | 7a | 0 to 5°F |
| Tilton | 6a | −10 to −5°F |
| Timberlane | 5b | −15 to −10°F |
| Tinley Park | 6a | −10 to −5°F |
| Tiskilwa | 5b | −15 to −10°F |
| Toledo | 6b | −5 to 0°F |
| Tolono | 6a | −10 to −5°F |
| Toluca | 5b | −15 to −10°F |
| Tonica | 5b | −15 to −10°F |
| Topeka | 6a | −10 to −5°F |
| Toulon | 5b | −15 to −10°F |
| Tovey | 6a | −10 to −5°F |
| Towanda | 6a | −10 to −5°F |
| Tower Hill | 6b | −5 to 0°F |
| Tower Lakes | 5b | −15 to −10°F |
| Tremont | 6a | −10 to −5°F |
| Trenton | 6b | −5 to 0°F |
| Trout Valley | 5b | −15 to −10°F |
| Troy | 7a | 0 to 5°F |
| Troy Grove | 5b | −15 to −10°F |
| Tuscola | 6a | −10 to −5°F |
| Ullin | 7a | 0 to 5°F |
| Union | 5b | −15 to −10°F |
| Union Hill | 5b | −15 to −10°F |
| University Park | 6a | −10 to −5°F |
| Urbana | 6a | −10 to −5°F |
| Ursa | 6a | −10 to −5°F |
| Valier | 7a | 0 to 5°F |
| Valley City | 6a | −10 to −5°F |
| Valmeyer | 7a | 0 to 5°F |
| Vandalia | 6b | −5 to 0°F |
| Varna | 5b | −15 to −10°F |
| Venedy | 6b | −5 to 0°F |
| Venice | 7a | 0 to 5°F |
| Vergennes | 7a | 0 to 5°F |
| Vermilion | 6a | −10 to −5°F |
| Vermont | 6a | −10 to −5°F |
| Vernon | 6b | −5 to 0°F |
| Vernon Hills | 6a | −10 to −5°F |
| Verona | 5b | −15 to −10°F |
| Versailles | 6a | −10 to −5°F |
| Victoria | 5b | −15 to −10°F |
| Vienna | 7a | 0 to 5°F |
| Villa Grove | 6a | −10 to −5°F |
| Villa Park | 6a | −10 to −5°F |
| Viola | 5b | −15 to −10°F |
| Virden | 6b | −5 to 0°F |
| Virgil | 5b | −15 to −10°F |
| Virginia | 6a | −10 to −5°F |
| Volo | 5b | −15 to −10°F |
| Wadsworth | 5b | −15 to −10°F |
| Waggoner | 6a | −10 to −5°F |
| Walnut | 5b | −15 to −10°F |
| Walnut Hill | 6b | −5 to 0°F |
| Walshville | 6b | −5 to 0°F |
| Waltonville | 6b | −5 to 0°F |
| Wamac | 6b | −5 to 0°F |
| Wapella | 6a | −10 to −5°F |
| Warren | 5a | −20 to −15°F |
| Warrensburg | 6a | −10 to −5°F |
| Warrenville | 5b | −15 to −10°F |
| Warsaw | 6a | −10 to −5°F |
| Washburn | 5b | −15 to −10°F |
| Washington | 6a | −10 to −5°F |
| Washington Park | 7a | 0 to 5°F |
| Wataga | 5b | −15 to −10°F |
| Waterloo | 7a | 0 to 5°F |
| Waterman | 5b | −15 to −10°F |
| Watseka | 5b | −15 to −10°F |
| Watson | 6b | −5 to 0°F |
| Wauconda | 5b | −15 to −10°F |
| Waukegan | 6a | −10 to −5°F |
| Waverly | 6a | −10 to −5°F |
| Wayne | 5b | −15 to −10°F |
| Wayne City | 6b | −5 to 0°F |
| Waynesville | 6a | −10 to −5°F |
| Weldon | 6a | −10 to −5°F |
| Wellington | 6a | −10 to −5°F |
| Wenona | 5b | −15 to −10°F |
| Wenonah | 6a | −10 to −5°F |
| West Brooklyn | 5b | −15 to −10°F |
| West Chicago | 5b | −15 to −10°F |
| West City | 7a | 0 to 5°F |
| West Dundee | 5b | −15 to −10°F |
| West Frankfort | 7a | 0 to 5°F |
| West Peoria | 6a | −10 to −5°F |
| West Point | 6a | −10 to −5°F |
| West Salem | 6b | −5 to 0°F |
| Westchester | 6a | −10 to −5°F |
| Western Springs | 6a | −10 to −5°F |
| Westfield | 6a | −10 to −5°F |
| Westmont | 6a | −10 to −5°F |
| Westville | 6a | −10 to −5°F |
| Wheaton | 5b | −15 to −10°F |
| Wheeler | 6b | −5 to 0°F |
| Wheeling | 6a | −10 to −5°F |
| White City | 6b | −5 to 0°F |
| White Hall | 6a | −10 to −5°F |
| Williamsfield | 5b | −15 to −10°F |
| Williamson | 6b | −5 to 0°F |
| Williamsville | 6a | −10 to −5°F |
| Willisville | 7a | 0 to 5°F |
| Willow Hill | 6b | −5 to 0°F |
| Willow Springs | 6a | −10 to −5°F |
| Willowbrook | 6a | −10 to −5°F |
| Wilmette | 6a | −10 to −5°F |
| Wilmington | 5b | −15 to −10°F |
| Wilsonville | 6b | −5 to 0°F |
| Winchester | 6a | −10 to −5°F |
| Windsor | 6a | −10 to −5°F |
| Winfield | 5b | −15 to −10°F |
| Winnebago | 5b | −15 to −10°F |
| Winnetka | 6a | −10 to −5°F |
| Winslow | 5a | −20 to −15°F |
| Winthrop Harbor | 6a | −10 to −5°F |
| Witt | 6b | −5 to 0°F |
| Wonder Lake | 5b | −15 to −10°F |
| Wood Dale | 6a | −10 to −5°F |
| Wood River | 7a | 0 to 5°F |
| Woodhull | 5b | −15 to −10°F |
| Woodland | 5b | −15 to −10°F |
| Woodlawn | 6b | −5 to 0°F |
| Woodridge | 6a | −10 to −5°F |
| Woodson | 6a | −10 to −5°F |
| Woodstock | 5b | −15 to −10°F |
| Worden | 6b | −5 to 0°F |
| Worth | 6a | −10 to −5°F |
| Wyanet | 5b | −15 to −10°F |
| Wyoming | 5b | −15 to −10°F |
| Xenia | 6b | −5 to 0°F |
| Yale | 6b | −5 to 0°F |
| Yates City | 5b | −15 to −10°F |
| Yorkville | 5b | −15 to −10°F |
| Zeigler | 7a | 0 to 5°F |
| Zion | 6a | −10 to −5°F |
Source: USDA Plant Hardiness Zone Map, 2023, Agricultural Research Service, U.S. Department of Agriculture; ZIP code table from the PRISM Group, Oregon State University (accessed Oct 2026). This list is our own summary, not the official USDA map. See how we calculate.
Frequently asked questions
What planting zone is Illinois?
Illinois spans zones 5a to 7a on the 2023 USDA map, and zone 6a is the most common. Look up your ZIP code for your exact zone.
What zone is Chicago, IL?
Chicago is zone 6a, where the coldest night of an average winter falls from −10 to −5°F. Plants rated hardy to zone 6 or colder should survive a typical winter there.
More for Illinois: Illinois climate zones (insulation) · Last frost dates in Illinois · Frost line depth by state