Idaho planting zones & frost dates
USDA hardiness zones in Idaho go from 5a to 7b. Pick your city for its average frost dates and a planting calendar, or search by ZIP code.
| City | Zone | Avg. last frost | Avg. first frost |
|---|---|---|---|
| Ammon | 5b | May 9 | Oct 1 |
| Boise | 7a | Apr 24 | Oct 21 |
| Burley | 6b | May 7 | Oct 4 |
| Caldwell | 7a | Apr 23 | Oct 18 |
| Chubbuck | 6a | May 2 | Oct 11 |
| Coeur d'Alene | 7a | Apr 22 | Oct 18 |
| Conda | 5a | May 29 | Sep 17 |
| Eagle | 7a | Apr 24 | Oct 21 |
| Eagle Foothills | 7a | Apr 30 | Oct 17 |
| Garden City | 7a | Apr 24 | Oct 21 |
| Hayden | 6b | Apr 22 | Oct 18 |
| Idaho Falls | 5b | May 9 | Oct 1 |
| Jerome | 6b | May 2 | Oct 14 |
| Kuna | 7a | Apr 24 | Oct 21 |
| Lewiston | 7a | Apr 6 | Oct 26 |
| Lewiston Orchards | 7b | Apr 6 | Oct 26 |
| Meridian | 7a | Apr 24 | Oct 21 |
| Moscow | 6b | Apr 29 | Oct 2 |
| Nampa | 7a | Apr 29 | Oct 13 |
| Pocatello | 6a | May 2 | Oct 11 |
| Post Falls | 6b | Apr 22 | Oct 18 |
| Rexburg | 5a | May 15 | Sep 23 |
| Twin Falls | 6b | Apr 30 | Oct 9 |
Cities with 10,000+ residents. Data: USDA Plant Hardiness Zone Map 2023 and NOAA Climate Normals 1991–2020. Sources and method.