Maine frost dates: P
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Palermo | May 2 | Oct 10 | 161 d | 5b |
| Palmyra | May 8 | Oct 3 | 148 d | 5a |
| Paris | May 6 | Oct 3 | 150 d | 5b |
| Parsonsfield | May 12 | Oct 1 | 142 d | 5b |
| Passadumkeag | May 4 | Oct 6 | 155 d | 5a |
| Patten | May 13 | Sep 30 | 140 d | 4b |
| Peaks Island | Apr 26 | Oct 15 | 172 d | 6a |
| Pemaquid | Apr 28 | Oct 21 | 176 d | 6a |
| Pembroke | May 5 | Oct 13 | 161 d | 5b |
| Penobscot | May 8 | Oct 9 | 154 d | 5b |
| Perham | May 7 | Oct 1 | 147 d | 4a |
| Perry | May 5 | Oct 13 | 161 d | 6a |
| Peru | May 4 | Oct 6 | 155 d | 5a |
| Phillips | May 16 | Sep 26 | 133 d | 4b |
| Phippsburg | Apr 28 | Oct 21 | 176 d | 6a |
| Pittsfield | May 8 | Oct 3 | 148 d | 5a |
| Plymouth | May 8 | Oct 3 | 148 d | 5a |
| Poland | May 3 | Oct 7 | 157 d | 5b |
| Port Clyde | Apr 27 | Oct 25 | 181 d | 6b |
| Portage | May 7 | Oct 1 | 147 d | 4a |
| Porter | May 12 | Oct 1 | 142 d | 5a |
| Portland | Apr 26 | Oct 15 | 172 d | 6a |
| Pownal | Apr 28 | Oct 19 | 174 d | 5b |
| Presque Isle | May 14 | Sep 26 | 135 d | 4a |
| Princeton | May 4 | Oct 10 | 159 d | 5b |
| Prospect Harbor | Apr 27 | Oct 22 | 178 d | 6a |