Planting zones by state
Idaho Planting Zones
Idaho runs from zone 4a to zone 7b on the 2023 USDA map. Zone 6b is the most common, covering 28% of the state's ZIP codes. Coeur d'Alene is 6b, Pocatello is 6a and Idaho Falls is 5b.
Zones across Idaho
| Zone | Average coldest night | Share of Idaho ZIP codes |
|---|---|---|
| 4a | −30 to −25°F | under 1% |
| 4b | −25 to −20°F | under 1% |
| 5a | −20 to −15°F | 13% |
| 5b | −15 to −10°F | 14% |
| 6a | −10 to −5°F | 17% |
| 6b | −5 to 0°F | 28% |
| 7a | 0 to 5°F | 26% |
| 7b | 5 to 10°F | under 1% |
Planting zone for every city and town in Idaho
Each Idaho 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 |
|---|---|---|
| Aberdeen | 5b | −15 to −10°F |
| Acequia | 6a | −10 to −5°F |
| Albion | 6b | −5 to 0°F |
| American Falls | 6a | −10 to −5°F |
| Ammon | 5b | −15 to −10°F |
| Arco | 5a | −20 to −15°F |
| Arimo | 6b | −5 to 0°F |
| Ashton | 5a | −20 to −15°F |
| Athol | 6b | −5 to 0°F |
| Bancroft | 5a | −20 to −15°F |
| Basalt | 5b | −15 to −10°F |
| Bellevue | 6a | −10 to −5°F |
| Blackfoot | 5b | −15 to −10°F |
| Bliss | 7a | 0 to 5°F |
| Bloomington | 5a | −20 to −15°F |
| Boise City | 7a | 0 to 5°F |
| Bonners Ferry | 6b | −5 to 0°F |
| Bovill | 6a | −10 to −5°F |
| Buhl | 7a | 0 to 5°F |
| Burley | 6b | −5 to 0°F |
| Butte City | 5a | −20 to −15°F |
| Caldwell | 7a | 0 to 5°F |
| Cambridge | 6a | −10 to −5°F |
| Carey | 6a | −10 to −5°F |
| Cascade | 5a | −20 to −15°F |
| Castleford | 6b | −5 to 0°F |
| Challis | 5b | −15 to −10°F |
| Chubbuck | 6b | −5 to 0°F |
| Clark Fork | 6b | −5 to 0°F |
| Clayton | 5b | −15 to −10°F |
| Clifton | 6a | −10 to −5°F |
| Coeur d'Alene | 6b | −5 to 0°F |
| Cottonwood | 6b | −5 to 0°F |
| Council | 6a | −10 to −5°F |
| Craigmont | 6b | −5 to 0°F |
| Crouch | 6b | −5 to 0°F |
| Culdesac | 7a | 0 to 5°F |
| Dalton Gardens | 6b | −5 to 0°F |
| Dayton | 6a | −10 to −5°F |
| Deary | 6b | −5 to 0°F |
| Declo | 6b | −5 to 0°F |
| Dietrich | 6a | −10 to −5°F |
| Donnelly | 5a | −20 to −15°F |
| Dover | 6b | −5 to 0°F |
| Downey | 6b | −5 to 0°F |
| Driggs | 5a | −20 to −15°F |
| Drummond | 5a | −20 to −15°F |
| Dubois | 5b | −15 to −10°F |
| Eagle | 7a | 0 to 5°F |
| East Hope | 6b | −5 to 0°F |
| Eden | 6b | −5 to 0°F |
| Elk River | 6b | −5 to 0°F |
| Emmett | 7a | 0 to 5°F |
| Fairfield | 5a | −20 to −15°F |
| Ferdinand | 6a | −10 to −5°F |
| Fernan Lake Village | 6b | −5 to 0°F |
| Filer | 7a | 0 to 5°F |
| Firth | 5b | −15 to −10°F |
| Franklin | 6a | −10 to −5°F |
| Fruitland | 7a | 0 to 5°F |
| Garden City | 7a | 0 to 5°F |
| Genesee | 7a | 0 to 5°F |
| Georgetown | 5b | −15 to −10°F |
| Glenns Ferry | 7a | 0 to 5°F |
| Gooding | 6b | −5 to 0°F |
| Grace | 5b | −15 to −10°F |
| Grand View | 7a | 0 to 5°F |
| Grangeville | 6b | −5 to 0°F |
| Greenleaf | 7a | 0 to 5°F |
| Hagerman | 7a | 0 to 5°F |
| Hailey | 6a | −10 to −5°F |
| Hamer | 5a | −20 to −15°F |
| Hansen | 6b | −5 to 0°F |
| Harrison | 6b | −5 to 0°F |
| Hauser | 6b | −5 to 0°F |
| Hayden | 6b | −5 to 0°F |
| Hayden Lake | 6b | −5 to 0°F |
| Hazelton | 6b | −5 to 0°F |
| Heyburn | 6b | −5 to 0°F |
| Hollister | 6b | −5 to 0°F |
| Homedale | 7a | 0 to 5°F |
| Hope | 6b | −5 to 0°F |
| Horseshoe Bend | 7a | 0 to 5°F |
| Huetter | 6b | −5 to 0°F |
| Idaho City | 6b | −5 to 0°F |
| Idaho Falls | 5b | −15 to −10°F |
| Inkom | 6a | −10 to −5°F |
| Iona | 5b | −15 to −10°F |
| Irwin | 6a | −10 to −5°F |
| Island Park | 4a | −30 to −25°F |
| Jerome | 6b | −5 to 0°F |
| Juliaetta | 7b | 5 to 10°F |
| Kamiah | 7a | 0 to 5°F |
| Kellogg | 6b | −5 to 0°F |
| Kendrick | 7a | 0 to 5°F |
| Ketchum | 5b | −15 to −10°F |
| Kimberly | 6b | −5 to 0°F |
| Kooskia | 7a | 0 to 5°F |
| Kootenai | 6b | −5 to 0°F |
| Kuna | 7a | 0 to 5°F |
| Lapwai | 7b | 5 to 10°F |
| Lava Hot Springs | 6b | −5 to 0°F |
| Leadore | 5a | −20 to −15°F |
| Lewiston | 7b | 5 to 10°F |
| Lewisville | 5a | −20 to −15°F |
| Lost River | 5a | −20 to −15°F |
| Mackay | 5a | −20 to −15°F |
| Malad City | 6a | −10 to −5°F |
| Malta | 6a | −10 to −5°F |
| Marsing | 7a | 0 to 5°F |
| McCall | 5a | −20 to −15°F |
| McCammon | 5b | −15 to −10°F |
| Melba | 7a | 0 to 5°F |
| Menan | 5a | −20 to −15°F |
| Meridian | 7a | 0 to 5°F |
| Middleton | 7a | 0 to 5°F |
| Midvale | 6a | −10 to −5°F |
| Minidoka | 6a | −10 to −5°F |
| Montpelier | 5a | −20 to −15°F |
| Moore | 5a | −20 to −15°F |
| Moscow | 6b | −5 to 0°F |
| Mountain Home | 7a | 0 to 5°F |
| Moyie Springs | 6b | −5 to 0°F |
| Mud Lake | 4b | −25 to −20°F |
| Mullan | 6a | −10 to −5°F |
| Murtaugh | 6b | −5 to 0°F |
| Nampa | 7a | 0 to 5°F |
| New Meadows | 6a | −10 to −5°F |
| New Plymouth | 7a | 0 to 5°F |
| Newdale | 5a | −20 to −15°F |
| Nezperce | 6b | −5 to 0°F |
| Notus | 7a | 0 to 5°F |
| Oakley | 6b | −5 to 0°F |
| Oldtown | 6a | −10 to −5°F |
| Onaway | 6b | −5 to 0°F |
| Orofino | 7a | 0 to 5°F |
| Osburn | 6b | −5 to 0°F |
| Oxford | 6b | −5 to 0°F |
| Paris | 5a | −20 to −15°F |
| Parker | 5a | −20 to −15°F |
| Parma | 7a | 0 to 5°F |
| Paul | 6b | −5 to 0°F |
| Payette | 7a | 0 to 5°F |
| Peck | 7a | 0 to 5°F |
| Pierce | 6a | −10 to −5°F |
| Pinehurst | 6b | −5 to 0°F |
| Placerville | 6b | −5 to 0°F |
| Plummer | 6b | −5 to 0°F |
| Pocatello | 6a | −10 to −5°F |
| Ponderay | 6b | −5 to 0°F |
| Post Falls | 6b | −5 to 0°F |
| Potlatch | 6b | −5 to 0°F |
| Preston | 6a | −10 to −5°F |
| Priest River | 6a | −10 to −5°F |
| Rathdrum | 6b | −5 to 0°F |
| Reubens | 6b | −5 to 0°F |
| Rexburg | 5a | −20 to −15°F |
| Richfield | 6a | −10 to −5°F |
| Rigby | 5b | −15 to −10°F |
| Riggins | 6b | −5 to 0°F |
| Ririe | 5b | −15 to −10°F |
| Roberts | 5a | −20 to −15°F |
| Rockland | 6a | −10 to −5°F |
| Rupert | 6a | −10 to −5°F |
| Salmon | 5b | −15 to −10°F |
| Sandpoint | 6b | −5 to 0°F |
| Shelley | 5b | −15 to −10°F |
| Shoshone | 6a | −10 to −5°F |
| Smelterville | 6b | −5 to 0°F |
| Soda Springs | 5a | −20 to −15°F |
| Spencer | 5b | −15 to −10°F |
| Spirit Lake | 6b | −5 to 0°F |
| St. Anthony | 5a | −20 to −15°F |
| St. Charles | 5b | −15 to −10°F |
| St. Maries | 6b | −5 to 0°F |
| Stanley | 5b | −15 to −10°F |
| Star | 7a | 0 to 5°F |
| State Line | 6b | −5 to 0°F |
| Stites | 7a | 0 to 5°F |
| Sugar City | 5a | −20 to −15°F |
| Sun Valley | 5b | −15 to −10°F |
| Swan Valley | 6a | −10 to −5°F |
| Tensed | 6b | −5 to 0°F |
| Teton | 5a | −20 to −15°F |
| Tetonia | 5a | −20 to −15°F |
| Troy | 6b | −5 to 0°F |
| Twin Falls | 7a | 0 to 5°F |
| Victor | 5a | −20 to −15°F |
| Wallace | 6b | −5 to 0°F |
| Wardner | 6b | −5 to 0°F |
| Warm River | 5a | −20 to −15°F |
| Weippe | 6b | −5 to 0°F |
| Weiser | 7a | 0 to 5°F |
| Wendell | 6b | −5 to 0°F |
| Weston | 6a | −10 to −5°F |
| White Bird | 7a | 0 to 5°F |
| Wilder | 7a | 0 to 5°F |
| Winchester | 6b | −5 to 0°F |
| Worley | 6b | −5 to 0°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 Idaho?
Idaho spans zones 4a to 7b on the 2023 USDA map, and zone 6b is the most common. Look up your ZIP code for your exact zone.
What zone is Coeur d'Alene, ID?
Coeur d'Alene is zone 6b, where the coldest night of an average winter falls from −5 to 0°F. Plants rated hardy to zone 6 or colder should survive a typical winter there.
More for Idaho: Idaho climate zones (insulation) · Last frost dates in Idaho · Frost line depth by state