North Dakota frost dates: P
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Page | May 10 | Sep 24 | 137 d | 4a |
| Palermo | May 17 | Sep 23 | 129 d | 4a |
| Park River | May 4 | Oct 7 | 156 d | 4a |
| Parshall | May 17 | Sep 23 | 129 d | 4a |
| Pekin | May 12 | Sep 28 | 139 d | 4a |
| Pembina | May 16 | Sep 29 | 136 d | 3b |
| Penn | May 12 | Sep 30 | 141 d | 4a |
| Perth | May 20 | Sep 26 | 129 d | 3b |
| Petersburg | May 11 | Sep 28 | 140 d | 4a |
| Pettibone | May 13 | Sep 29 | 139 d | 4a |
| Pillsbury | May 10 | Sep 24 | 137 d | 4a |
| Pingree | May 11 | Sep 28 | 140 d | 4a |
| Pisek | May 4 | Oct 7 | 156 d | 4a |
| Plaza | May 17 | Sep 23 | 129 d | 4a |
| Portal | May 20 | Sep 19 | 122 d | 3b |
| Portland | May 13 | Sep 27 | 137 d | 4a |
| Powers Lake | May 18 | Sep 17 | 122 d | 4a |