Idaho frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Laclede | May 8 | Sep 28 | 143 d | 6b |
| Lake Fork | Jun 22 | Sep 2 | 72 d | 5a |
| Lapwai | Apr 6 | Oct 26 | 203 d | 7b |
| Lava Hot Springs | May 21 | Sep 21 | 123 d | 6b |
| Leadore | frost any month | 5a | ||
| Lemhi | frost any month | 5b | ||
| Lenore | Apr 20 | Oct 20 | 183 d | 7a |
| Letha | Apr 30 | Oct 17 | 170 d | 7a |
| Lewiston | Apr 6 | Oct 26 | 203 d | 7b |
| Lewisville | May 9 | Oct 5 | 149 d | 5a |
| Lowman | Jun 6 | Sep 4 | 90 d | 6a |
| Lucile | May 6 | Oct 9 | 156 d | 7a |