Oregon frost dates: P
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Pacific City | Mar 17 | Nov 22 | 250 d | 9b |
| Paisley | Jun 6 | Sep 14 | 100 d | 6b |
| Paulina | frost any month | 6a | ||
| Pendleton | Apr 22 | Oct 9 | 170 d | 7a |
| Philomath | May 15 | Oct 8 | 146 d | 8b |
| Phoenix | May 6 | Oct 8 | 155 d | 8b |
| Pilot Rock | May 7 | Oct 4 | 150 d | 6b |
| Pleasant Hill | Mar 7 | Nov 27 | 265 d | 8b |
| Plush | frost any month | 6b | ||
| Port Orford | Feb 17 | Dec 3 | 289 d | 9b |
| Portland | Feb 25 | Dec 1 | 279 d | 9a |
| Post | Jun 2 | Sep 17 | 107 d | 6a |
| Powell Butte | Jun 9 | Sep 14 | 97 d | 6b |
| Powers | Mar 21 | Nov 14 | 238 d | 9a |
| Prairie City | frost any month | 6b | ||
| Princeton | May 29 | Sep 18 | 112 d | 6b |
| Prineville | Jun 1 | Sep 22 | 113 d | 6b |
| Prospect | May 19 | Oct 3 | 137 d | 8a |