Idaho has 9 USDA hardiness zones from 3b to 7b, with average winter lows from -35°F in Clark and Fremont Counties’ eastern mountains to 10°F across the Treasure Valley around Boise, per the 2023 USDA Plant Hardiness Zone Map.
The eastern mountains register zone 3b in Clark and Fremont Counties, with Custer County reaching 4a in the Lost River Range. Pocatello at zones 6a–6b anchors the southeast (Bannock County), with Idaho Falls at zone 5b. The Snake River Plain warms from Twin Falls 6b–7a to Boise at zones 6b–7a–7b and Meridian at zone 7a, with Nampa and Caldwell at zone 7a. The northern panhandle covers Coeur d’Alene 6b–7a, while the Salmon and Clearwater Canyons reach zone 7b at Riggins.
Idaho’s hardiness zones are also called planting zones, growing zones, gardening zones, plant zones, USDA zones, or climate zones.
Use the city, town, and county lists below, search by ZIP code, or open the interactive Idaho planting zones map for precise USDA zone locations.
Idaho Planting Zones by ZIP Code
Idaho Planting Zones Map
Planting Zones
Planting Zones
USDA Hardiness Zones for Idaho Counties
| Idaho Counties | 2023 USDA Hardiness Zones |
|---|---|
| Ada County | Zone 6b, 7a and 7b |
| Adams County | Zone 5a, 5b, 6a, 6b, 7a and 7b |
| Bannock County | Zone 5b, 6a, 6b and 7a |
| Bear Lake County | Zone 4b, 5a, 5b and 6a |
| Benewah County | Zone 6a, 6b and 7a |
| Bingham County | Zone 4b, 5a, 5b, 6a and 6b |
| Blaine County | Zone 4b, 5a, 5b, 6a and 6b |
| Boise County | Zone 4b, 5a, 5b, 6a, 6b and 7a |
| Bonner County | Zone 5a, 5b, 6a, 6b and 7a |
| Bonneville County | Zone 4b, 5a, 5b, 6a and 6b |
| Boundary County | Zone 5a, 5b, 6a and 6b |
| Butte County | Zone 4b, 5a, 5b, 6a and 6b |
| Camas County | Zone 4b, 5a, 5b, 6a, 6b and 7a |
| Canyon County | Zone 7a and 7b |
| Caribou County | Zone 4b, 5a, 5b, 6a and 6b |
| Cassia County | Zone 6a and 6b |
| Clark County | Zone 3b, 4a, 4b, 5a, 5b and 6a |
| Clearwater County | Zone 5b, 6a, 6b, 7a and 7b |
| Custer County | Zone 4a, 4b, 5a, 5b, 6a and 6b |
| Elmore County | Zone 4b, 5a, 5b, 6a, 6b, 7a and 7b |
| Franklin County | Zone 5b, 6a and 6b |
| Fremont County | Zone 3b, 4a, 4b, 5a and 5b |
| Gem County | Zone 5b, 6a, 6b, 7a and 7b |
| Gooding County | Zone 6a, 6b, 7a and 7b |
| Idaho County | Zone 4b, 5a, 5b, 6a, 6b, 7a and 7b |
| Jefferson County | Zone 4b, 5a, 5b and 6a |
| Jerome County | Zone 6a, 6b and 7a |
| Kootenai County | Zone 6a, 6b and 7a |
| Latah County | Zone 6a, 6b, 7a and 7b |
| Lemhi County | Zone 4b, 5a, 5b, 6a and 6b |
| Lewis County | Zone 6a, 6b, 7a and 7b |
| Lincoln County | Zone 5b, 6a, 6b and 7a |
| Madison County | Zone 5a, 5b and 6a |
| Minidoka County | Zone 5b, 6a and 6b |
| Nez Perce County | Zone 6b, 7a and 7b |
| Oneida County | Zone 6a, 6b and 7a |
| Owyhee County | Zone 5b, 6a, 6b, 7a and 7b |
| Payette County | Zone 6b and 7a |
| Power County | Zone 5b, 6a, 6b and 7a |
| Shoshone County | Zone 5b, 6a, 6b and 7a |
| Teton County | Zone 4b, 5a, 5b and 6a |
| Twin Falls County | Zone 5a, 5b, 6a, 6b and 7a |
| Valley County | Zone 4b, 5a, 5b, 6a, 6b and 7a |
| Washington County | Zone 5b, 6a, 6b, 7a and 7b |
USDA Hardiness Zones for Idaho Cities and Towns
| Idaho City/Town | 2023 USDA Hardiness Zone(s) |
|---|---|
| Aberdeen | Zone 5b |
| Acequia | Zone 6a |
| Albion | Zone 6b |
| American Falls | Zone 6a |
| Ammon | Zone 5b |
| Arbon Valley | Zone 6a and 6b |
| Arco | Zone 5a and 5b |
| Arimo | Zone 5b |
| Ashton | Zone 5a |
| Athol | Zone 6a and 6b |
| Atomic City | Zone 5a |
| Bancroft | Zone 5a |
| Banks | Zone 6b and 7a |
| Basalt | Zone 5b |
| Bellevue | Zone 6a and 6b |
| Bennington | Zone 4b and 5a |
| Blackfoot | Zone 5b |
| Blanchard | Zone 6a and 6b |
| Bliss | Zone 7a |
| Bloomington | Zone 5a |
| Boise | Zone 6b, 7a and 7b |
| Bonners Ferry | Zone 6b |
| Bovill | Zone 6b |
| Buhl | Zone 7a |
| Burley | Zone 6b |
| Butte City | Zone 5a |
| Caldwell | Zone 7a |
| Cambridge | Zone 6a |
| Carey | Zone 5b |
| Cascade | Zone 5a and 5b |
| Castleford | Zone 6b |
| Challis | Zone 5b |
| Chubbuck | Zone 6a |
| Clark Fork | Zone 6a and 6b |
| Clayton | Zone 5a and 5b |
| Clifton | Zone 6a |
| Coeur d’Alene | Zone 6b and 7a |
| Conkling Park | Zone 6b |
| Cottonwood | Zone 6b |
| Council | Zone 6a |
| Craigmont | Zone 6a |
| Crouch | Zone 6b |
| Culdesac | Zone 7a and 7b |
| Dalton Gardens | Zone 6b |
| Dayton | Zone 6a |
| De Smet | Zone 6b |
| Deary | Zone 6b |
| Declo | Zone 6a and 6b |
| Dietrich | Zone 6a |
| Donnelly | Zone 5a |
| Dover | Zone 6a and 6b |
| Downey | Zone 5b |
| Driggs | Zone 4b and 5a |
| Drummond | Zone 5a |
| Dubois | Zone 5a and 5b |
| Eagle | Zone 7a |
| East Hope | Zone 6b |
| Eden | Zone 6b |
| Elk City | Zone 5a and 5b |
| Elk River | Zone 6a and 6b |
| Emmett | Zone 7a |
| Fairfield | Zone 5a |
| Ferdinand | Zone 6a |
| Fernan Lake Village | Zone 7a |
| Filer | Zone 7a |
| Firth | Zone 5b |
| Fort Hall | Zone 5b and 6a |
| Franklin | Zone 6a |
| Garden City | Zone 7a |
| Garden Valley | Zone 6b |
| Genesee | Zone 7a |
| Georgetown | Zone 5a |
| Glenns Ferry | Zone 7a |
| Gooding | Zone 6b |
| Grace | Zone 5a and 5b |
| Grand View | Zone 7a |
| Grangeville | Zone 6b |
| Greenleaf | Zone 7a |
| Groveland | Zone 5b |
| Hagerman | Zone 7a |
| Hailey | Zone 6a |
| Hamer | Zone 4b and 5a |
| Hansen | Zone 6b |
| Harrison | Zone 6b and 7a |
| Hauser | Zone 6b and 7a |
| Hayden | Zone 6b |
| Hayden Lake | Zone 6b |
| Hazelton | Zone 6b |
| Heyburn | Zone 6a and 6b |
| Hidden Spring | Zone 7a |
| Hollister | Zone 6b |
| Homedale | Zone 7a |
| Hope | Zone 6b |
| Horseshoe Bend | Zone 7a |
| Huetter | Zone 6b and 7a |
| Idaho City | Zone 6a |
| Idaho Falls | Zone 5b |
| Inkom | Zone 6a |
| Iona | Zone 5b |
| Irwin | Zone 5a and 5b |
| Island Park | Zone 3b, 4a and 4b |
| Jerome | Zone 6b |
| Juliaetta | Zone 7b |
| Kamiah | Zone 7a and 7b |
| Kellogg | Zone 6b |
| Kendrick | Zone 7a and 7b |
| Ketchum | Zone 5b and 6a |
| Kooskia | Zone 7a and 7b |
| Kootenai | Zone 6b |
| Kuna | Zone 7a |
| Lapwai | Zone 7b |
| Lava Hot Springs | Zone 5b |
| Leadore | Zone 5a |
| Lewiston | Zone 7b |
| Lewisville | Zone 5a and 5b |
| Lincoln | Zone 5b |
| Lost River | Zone 5a, 5b and 6a |
| Lowman | Zone 5b and 6a |
| Mackay | Zone 5b |
| Malad City | Zone 6a |
| Malta | Zone 6a |
| Marsing | Zone 7a |
| McCall | Zone 5a and 5b |
| McCammon | Zone 5b |
| Melba | Zone 7a and 7b |
| Menan | Zone 5a and 5b |
| Meridian | Zone 7a |
| Middleton | Zone 7a |
| Midvale | Zone 6a |
| Minidoka | Zone 6a |
| Montpelier | Zone 4b and 5a |
| Moore | Zone 4b |
| Moreland | Zone 5b |
| Moscow | Zone 6b |
| Mountain Home | Zone 6b and 7a |
| Mountain Home AFB | Zone 7a |
| Moyie Springs | Zone 6b |
| Mud Lake | Zone 4b |
| Mullan | Zone 6a and 6b |
| Murphy | Zone 7a |
| Murtaugh | Zone 6b |
| Nampa | Zone 7a |
| New Meadows | Zone 5b |
| New Plymouth | Zone 7a |
| Nezperce | Zone 6b |
| Notus | Zone 7a |
| Oakley | Zone 6b |
| Oldtown | Zone 6a and 6b |
| Onaway | Zone 6b |
| Orofino | Zone 7b |
| Osburn | Zone 6b |
| Oxford | Zone 5b |
| Paris | Zone 5a |
| Parker | Zone 5a |
| Parkline | Zone 6b |
| Parma | Zone 7a |
| Paul | Zone 6a |
| Payette | Zone 7a |
| Peck | Zone 7b |
| Pierce | Zone 6a |
| Pinehurst | Zone 6b |
| Placerville | Zone 6a and 6b |
| Plummer | Zone 6b |
| Pocatello | Zone 6a and 6b |
| Ponderay | Zone 6b |
| Post Falls | Zone 6b and 7a |
| Potlatch | Zone 6b |
| Preston | Zone 6a |
| Priest River | Zone 6a and 6b |
| Princeton | Zone 6b |
| Rathdrum | Zone 6b |
| Reubens | Zone 6b |
| Rexburg | Zone 5a |
| Richfield | Zone 6a |
| Rigby | Zone 5b |
| Riggins | Zone 7b |
| Ririe | Zone 5b |
| Riverside | Zone 5b |
| Roberts | Zone 5a |
| Robie Creek | Zone 6b and 7a |
| Rockford | Zone 5b |
| Rockford Bay | Zone 6b |
| Rockland | Zone 6a |
| Salmon | Zone 5b |
| Sandpoint | Zone 6b |
| Shelley | Zone 5b |
| Shoshone | Zone 6b |
| Smelterville | Zone 6b |
| Smiths Ferry | Zone 5b and 6a |
| Soda Springs | Zone 5a and 5b |
| Spencer | Zone 5a and 5b |
| Spirit Lake | Zone 6a and 6b |
| St. Anthony | Zone 5a |
| St. Charles | Zone 5a |
| St. Maries | Zone 6b and 7a |
| Stanley | Zone 4a |
| Star | Zone 7a |
| State Line | Zone 6b and 7a |
| Stites | Zone 7b |
| Sugar City | Zone 5a |
| Sun Valley | Zone 5b and 6a |
| Swan Valley | Zone 5a and 5b |
| Sweetwater | Zone 7b |
| Tensed | Zone 6b |
| Teton | Zone 5a |
| Tetonia | Zone 4b and 5a |
| Troy | Zone 6b |
| Twin Falls | Zone 6b and 7a |
| Tyhee | Zone 6a |
| Ucon | Zone 5b |
| Victor | Zone 4b and 5a |
| Wallace | Zone 6b |
| Wardner | Zone 6b |
| Warm River | Zone 5a |
| Weippe | Zone 6b |
| Weiser | Zone 6b and 7a |
| Wendell | Zone 6b |
| Weston | Zone 6a |
| White Bird | Zone 7b |
| Wilder | Zone 7a |
| Winchester | Zone 6b |
| Worley | Zone 6b |