Idaho frost dates
Median last spring frost and first fall frost for 266 places in Idaho. Last frost ranges from Apr 6 in Lapwai to Jun 22 in Lake Fork.
Largest cities
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Boise | Apr 24 | Oct 21 | 180 d | 7a |
| Meridian | Apr 29 | Oct 13 | 167 d | 7a |
| Nampa | Apr 29 | Oct 13 | 167 d | 7a |
| Idaho Falls | May 9 | Oct 1 | 145 d | 5b |
| Pocatello | May 2 | Oct 11 | 162 d | 6a |
| Caldwell | Apr 23 | Oct 18 | 178 d | 7a |
| Coeur d'Alene | Apr 22 | Oct 18 | 179 d | 6b |
| Twin Falls | Apr 30 | Oct 9 | 162 d | 6b |
| Lewiston | Apr 6 | Oct 26 | 203 d | 7b |
| Post Falls | Apr 22 | Oct 18 | 179 d | 6b |
| Rexburg | May 12 | Sep 24 | 135 d | 5a |
| Moscow | frost any month | 6b | ||
| Eagle | May 17 | Oct 12 | 148 d | 7a |
| Conda | frost any month | 5a | ||
| Kuna | Apr 24 | Oct 21 | 180 d | 7a |
| Hayden | Apr 22 | Oct 18 | 179 d | 6b |
| Mountain Home | May 2 | Oct 8 | 159 d | 6b |
| Blackfoot | May 5 | Oct 3 | 151 d | 5b |
| Garden City | May 17 | Oct 12 | 148 d | 7a |
| Jerome | May 2 | Oct 14 | 165 d | 6b |
| Burley | May 7 | Oct 4 | 150 d | 6b |
| Hailey | May 13 | Oct 2 | 142 d | 6a |
| Sandpoint | May 8 | Sep 28 | 143 d | 6a |
| Star | Apr 29 | Oct 13 | 167 d | 7a |
| Rathdrum | Apr 22 | Oct 18 | 179 d | 6b |
| Payette | Apr 19 | Oct 20 | 184 d | 6b |
| Middleton | Apr 29 | Oct 13 | 167 d | 7a |
| Emmett | Apr 30 | Oct 17 | 170 d | 7a |
| Rupert | May 16 | Oct 1 | 138 d | 6a |
| Weiser | Apr 23 | Oct 13 | 173 d | 7a |
| Preston | May 16 | Sep 28 | 135 d | 6a |
| Fruitland | Apr 22 | Oct 9 | 170 d | 7a |
| Shelley | May 23 | Sep 20 | 120 d | 5b |
| American Falls | May 20 | Sep 26 | 129 d | 6a |
| Buhl | Apr 25 | Oct 15 | 173 d | 7a |
| Rigby | May 9 | Oct 5 | 149 d | 5b |
| Kimberly | May 6 | Oct 3 | 150 d | 6b |
| Saint Anthony | May 17 | Sep 22 | 128 d | 5a |
| Gooding | May 3 | Oct 1 | 151 d | 6b |
| Heyburn | May 7 | Oct 4 | 150 d | 6b |