Idaho frost dates: P
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Paris | Jun 17 | Sep 3 | 78 d | 5a |
| Parker | May 17 | Sep 22 | 128 d | 5a |
| Parma | Apr 27 | Oct 9 | 165 d | 7a |
| Paul | May 6 | Oct 6 | 153 d | 6a |
| Payette | Apr 19 | Oct 20 | 184 d | 6b |
| Peck | Apr 20 | Oct 20 | 183 d | 7a |
| Picabo | Jun 16 | Sep 9 | 85 d | 6a |
| Pierce | Jun 3 | Sep 7 | 96 d | 6a |
| Pinehurst | May 14 | Sep 26 | 135 d | 6b |
| Pingree | May 20 | Sep 20 | 123 d | 5b |
| Placerville | Jun 1 | Sep 10 | 101 d | 6b |
| Plummer | May 11 | Oct 5 | 147 d | 6b |
| Pocatello | May 2 | Oct 11 | 162 d | 6a |
| Pollock | May 6 | Oct 9 | 156 d | 6b |
| Ponderay | May 8 | Sep 28 | 143 d | 6b |
| Porthill | May 4 | Sep 30 | 149 d | |
| Post Falls | Apr 22 | Oct 18 | 179 d | 6b |
| Potlatch | May 15 | Sep 21 | 129 d | 6b |
| Preston | May 16 | Sep 28 | 135 d | 6a |
| Priest River | May 12 | Sep 21 | 132 d | 6a |
| Princeton | May 15 | Sep 21 | 129 d | 6b |