Colorado Planting Zones

Colorado runs from zone 4a to zone 7a on the 2023 USDA map. Zone 6a is the most common, covering 44% of the state's ZIP codes. Denver is 6a, Colorado Springs is 6a and Fort Collins is 5b.

Search by ZIP code or city

Zones across Colorado

Zone	Average coldest night	Share of Colorado ZIP codes
4a	−30 to −25°F	under 1%
4b	−25 to −20°F	2%
5a	−20 to −15°F	12%
5b	−15 to −10°F	35%
6a	−10 to −5°F	44%
6b	−5 to 0°F	6%
7a	0 to 5°F	2%

Planting zone for every city and town in Colorado

Each Colorado 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
Aguilar	6a	−10 to −5°F
Akron	5b	−15 to −10°F
Alamosa	4b	−25 to −20°F
Alma	5a	−20 to −15°F
Antonito	5a	−20 to −15°F
Arriba	5b	−15 to −10°F
Arvada	6a	−10 to −5°F
Aspen	5a	−20 to −15°F
Ault	5b	−15 to −10°F
Aurora	6a	−10 to −5°F
Avon	6a	−10 to −5°F
Basalt	5b	−15 to −10°F
Bayfield	6a	−10 to −5°F
Bennett	6a	−10 to −5°F
Berthoud	5b	−15 to −10°F
Bethune	6a	−10 to −5°F
Black Hawk	5b	−15 to −10°F
Blanca	5a	−20 to −15°F
Blue River	5a	−20 to −15°F
Bonanza	5b	−15 to −10°F
Boone	6a	−10 to −5°F
Boulder	6a	−10 to −5°F
Bow Mar	6a	−10 to −5°F
Branson	6a	−10 to −5°F
Breckenridge	5a	−20 to −15°F
Brighton	5b	−15 to −10°F
Brookside	6a	−10 to −5°F
Broomfield	6a	−10 to −5°F
Brush	5b	−15 to −10°F
Buena Vista	5b	−15 to −10°F
Burlington	6a	−10 to −5°F
Calhan	5b	−15 to −10°F
Campo	6b	−5 to 0°F
Canon City	6a	−10 to −5°F
Carbonate	6a	−10 to −5°F
Carbondale	6a	−10 to −5°F
Castle Pines	5b	−15 to −10°F
Castle Rock	5b	−15 to −10°F
Cedaredge	6b	−5 to 0°F
Centennial	6a	−10 to −5°F
Center	5a	−20 to −15°F
Central	5b	−15 to −10°F
Cheraw	6a	−10 to −5°F
Cherry Hills Village	6a	−10 to −5°F
Cheyenne Wells	6a	−10 to −5°F
City of Creede	5a	−20 to −15°F
Coal Creek	6a	−10 to −5°F
Cokedale	6a	−10 to −5°F
Collbran	5b	−15 to −10°F
Colorado Springs	6a	−10 to −5°F
Columbine Valley	6a	−10 to −5°F
Commerce City	6a	−10 to −5°F
Cortez	7a	0 to 5°F
Craig	5b	−15 to −10°F
Crawford	6a	−10 to −5°F
Crested Butte	5a	−20 to −15°F
Crestone	5a	−20 to −15°F
Cripple Creek	5b	−15 to −10°F
Crook	5b	−15 to −10°F
Dacono	5b	−15 to −10°F
De Beque	6a	−10 to −5°F
Deer Trail	5b	−15 to −10°F
Del Norte	5b	−15 to −10°F
Delta	6b	−5 to 0°F
Denver	6a	−10 to −5°F
Dillon	4b	−25 to −20°F
Dinosaur	6a	−10 to −5°F
Dolores	6b	−5 to 0°F
Dove Creek	6b	−5 to 0°F
Durango	6b	−5 to 0°F
Eads	6a	−10 to −5°F
Eagle	5b	−15 to −10°F
Eaton	5a	−20 to −15°F
Eckley	5b	−15 to −10°F
Edgewater	6a	−10 to −5°F
Elizabeth	5b	−15 to −10°F
Empire	5b	−15 to −10°F
Englewood	6a	−10 to −5°F
Erie	5b	−15 to −10°F
Estes Park	5b	−15 to −10°F
Evans	5b	−15 to −10°F
Fairplay	5b	−15 to −10°F
Federal Heights	6a	−10 to −5°F
Firestone	5b	−15 to −10°F
Flagler	5b	−15 to −10°F
Fleming	5b	−15 to −10°F
Florence	6a	−10 to −5°F
Fort Collins	5b	−15 to −10°F
Fort Lupton	5b	−15 to −10°F
Fountain	6a	−10 to −5°F
Fowler	6a	−10 to −5°F
Foxfield	6a	−10 to −5°F
Fraser	5a	−20 to −15°F
Frederick	5b	−15 to −10°F
Frisco	5a	−20 to −15°F
Fruita	7a	0 to 5°F
Garden City	5b	−15 to −10°F
Genoa	5b	−15 to −10°F
Georgetown	5b	−15 to −10°F
Gilcrest	5a	−20 to −15°F
Glendale	6a	−10 to −5°F
Glenwood Springs	6a	−10 to −5°F
Granada	6a	−10 to −5°F
Granby	5b	−15 to −10°F
Grand Junction	7a	0 to 5°F
Grand Lake	5a	−20 to −15°F
Greeley	5b	−15 to −10°F
Green Mountain Falls	5b	−15 to −10°F
Greenwood Village	6a	−10 to −5°F
Grover	5a	−20 to −15°F
Gypsum	5b	−15 to −10°F
Hartman	6a	−10 to −5°F
Haswell	5b	−15 to −10°F
Haxtun	5b	−15 to −10°F
Hayden	5a	−20 to −15°F
Hillrose	5b	−15 to −10°F
Holly	6a	−10 to −5°F
Holyoke	5b	−15 to −10°F
Hooper	5a	−20 to −15°F
Hot Sulphur Springs	5b	−15 to −10°F
Hotchkiss	6b	−5 to 0°F
Hudson	5b	−15 to −10°F
Hugo	5b	−15 to −10°F
Idaho Springs	5b	−15 to −10°F
Ignacio	6a	−10 to −5°F
Iliff	5b	−15 to −10°F
Jamestown	5b	−15 to −10°F
Johnstown	5b	−15 to −10°F
Julesburg	5b	−15 to −10°F
Keenesburg	5b	−15 to −10°F
Kersey	5a	−20 to −15°F
Kim	6a	−10 to −5°F
Kiowa	5b	−15 to −10°F
Kit Carson	5b	−15 to −10°F
Kremmling	5a	−20 to −15°F
La Jara	5a	−20 to −15°F
La Junta	6a	−10 to −5°F
La Salle	5b	−15 to −10°F
La Veta	6a	−10 to −5°F
Lafayette	6a	−10 to −5°F
Lake City	5a	−20 to −15°F
Lakeside	6a	−10 to −5°F
Lakewood	6a	−10 to −5°F
Lamar	6a	−10 to −5°F
Larkspur	5b	−15 to −10°F
Las Animas	6a	−10 to −5°F
Leadville	5a	−20 to −15°F
Limon	5b	−15 to −10°F
Littleton	6a	−10 to −5°F
Lochbuie	5b	−15 to −10°F
Lone Tree	6a	−10 to −5°F
Longmont	5b	−15 to −10°F
Louisville	6a	−10 to −5°F
Loveland	5b	−15 to −10°F
Lyons	6a	−10 to −5°F
Manassa	5a	−20 to −15°F
Mancos	6a	−10 to −5°F
Manitou Springs	6a	−10 to −5°F
Manzanola	6a	−10 to −5°F
Marble	6a	−10 to −5°F
Mead	5b	−15 to −10°F
Meeker	5b	−15 to −10°F
Merino	5b	−15 to −10°F
Milliken	5b	−15 to −10°F
Minturn	5a	−20 to −15°F
Moffat	5b	−15 to −10°F
Monte Vista	5a	−20 to −15°F
Montezuma	5a	−20 to −15°F
Montrose	6b	−5 to 0°F
Monument	5b	−15 to −10°F
Morrison	5b	−15 to −10°F
Mount Crested Butte	5a	−20 to −15°F
Mountain View	6a	−10 to −5°F
Mountain Village	5b	−15 to −10°F
Naturita	6b	−5 to 0°F
Nederland	5b	−15 to −10°F
New Castle	6a	−10 to −5°F
Northglenn	6a	−10 to −5°F
Norwood	6a	−10 to −5°F
Nucla	6a	−10 to −5°F
Nunn	5a	−20 to −15°F
Oak Creek	5a	−20 to −15°F
Olathe	6b	−5 to 0°F
Ophir	5b	−15 to −10°F
Orchard City	6b	−5 to 0°F
Otis	5b	−15 to −10°F
Ouray	5b	−15 to −10°F
Ovid	5b	−15 to −10°F
Pagosa Springs	5b	−15 to −10°F
Palisade	7a	0 to 5°F
Palmer Lake	5b	−15 to −10°F
Paoli	5b	−15 to −10°F
Paonia	6b	−5 to 0°F
Parachute	6a	−10 to −5°F
Parker	5b	−15 to −10°F
Peetz	5b	−15 to −10°F
Pierce	5b	−15 to −10°F
Pitkin	5a	−20 to −15°F
Platteville	5b	−15 to −10°F
Poncha Springs	6a	−10 to −5°F
Pritchett	6b	−5 to 0°F
Pueblo	6a	−10 to −5°F
Ramah	5b	−15 to −10°F
Rangely	6a	−10 to −5°F
Raymer (New Raymer)	5a	−20 to −15°F
Red Cliff	5a	−20 to −15°F
Rico	5b	−15 to −10°F
Ridgway	6a	−10 to −5°F
Rifle	6a	−10 to −5°F
Rockvale	6a	−10 to −5°F
Rocky Ford	6a	−10 to −5°F
Romeo	5a	−20 to −15°F
Rye	6a	−10 to −5°F
Saguache	5b	−15 to −10°F
Salida	5b	−15 to −10°F
San Luis	5b	−15 to −10°F
Sanford	5a	−20 to −15°F
Sawpit	5b	−15 to −10°F
Sedgwick	5b	−15 to −10°F
Seibert	5b	−15 to −10°F
Severance	5b	−15 to −10°F
Sheridan	6a	−10 to −5°F
Sheridan Lake	6a	−10 to −5°F
Silt	6a	−10 to −5°F
Silver Cliff	5b	−15 to −10°F
Silver Plume	5b	−15 to −10°F
Silverthorne	4b	−25 to −20°F
Silverton	5a	−20 to −15°F
Simla	5b	−15 to −10°F
Snowmass Village	5b	−15 to −10°F
South Fork	5b	−15 to −10°F
Springfield	6b	−5 to 0°F
Starkville	6a	−10 to −5°F
Steamboat Springs	4b	−25 to −20°F
Sterling	5b	−15 to −10°F
Stratton	6a	−10 to −5°F
Sugar City	5b	−15 to −10°F
Superior	6a	−10 to −5°F
Swink	6a	−10 to −5°F
Telluride	5b	−15 to −10°F
Thornton	6a	−10 to −5°F
Timnath	5b	−15 to −10°F
Trinidad	6a	−10 to −5°F
Two Buttes	6b	−5 to 0°F
Vail	5b	−15 to −10°F
Victor	5b	−15 to −10°F
Vilas	6b	−5 to 0°F
Vona	6a	−10 to −5°F
Walden	4b	−25 to −20°F
Walsenburg	6a	−10 to −5°F
Walsh	6b	−5 to 0°F
Ward	5b	−15 to −10°F
Wellington	5b	−15 to −10°F
Westcliffe	5b	−15 to −10°F
Westminster	6a	−10 to −5°F
Wheat Ridge	6a	−10 to −5°F
Wiggins	5a	−20 to −15°F
Wiley	6a	−10 to −5°F
Williamsburg	6a	−10 to −5°F
Windsor	5b	−15 to −10°F
Winter Park	5a	−20 to −15°F
Woodland Park	5b	−15 to −10°F
Wray	5b	−15 to −10°F
Yampa	5a	−20 to −15°F
Yuma	5b	−15 to −10°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 Colorado?

Colorado spans zones 4a 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 Denver, CO?

Denver 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 Colorado: Colorado climate zones (insulation) · Last frost dates in Colorado · Frost line depth by state