Idaho frost dates: N
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Nampa | Apr 29 | Oct 13 | 167 d | 7a |
| Naples | Apr 30 | Oct 4 | 157 d | 6b |
| New Meadows | frost any month | 6a | ||
| New Plymouth | Apr 22 | Oct 9 | 170 d | 7a |
| Newdale | May 17 | Sep 22 | 128 d | 5a |
| Nezperce | May 24 | Sep 20 | 119 d | 6b |
| Nordman | May 20 | Sep 13 | 116 d | 6a |
| North Fork | Jun 1 | Sep 17 | 108 d | 6a |
| Notus | Apr 27 | Oct 9 | 165 d | 7a |