Washington frost dates: P
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Pacific | Mar 8 | Nov 14 | 251 d | 8b |
| Pacific Beach | Apr 26 | Oct 22 | 179 d | 9a |
| Packwood | Apr 30 | Oct 8 | 161 d | 7a |
| Palisades | Apr 8 | Oct 24 | 199 d | 7a |
| Palouse | May 6 | Sep 29 | 146 d | 6b |
| Paradise Inn | Apr 11 | Oct 30 | 202 d | 7a |
| Parker | Apr 21 | Oct 15 | 177 d | 7a |
| Pasco | Apr 27 | Oct 11 | 167 d | 7a |
| Pateros | Apr 21 | Oct 15 | 177 d | 7a |
| Paterson | Apr 14 | Oct 21 | 190 d | 7b |
| Pe Ell | Apr 27 | Oct 22 | 178 d | 8a |
| Peshastin | May 10 | Sep 30 | 143 d | 7a |
| Plymouth | Mar 27 | Nov 4 | 222 d | 7b |
| Point Roberts | Mar 31 | Nov 4 | 218 d | 8b |
| Pomeroy | May 2 | Oct 4 | 155 d | 7a |
| Port Angeles | Mar 12 | Nov 19 | 252 d | 8b |
| Port Angeles (Clallam) | Apr 9 | Nov 3 | 208 d | 8b |
| Port Gamble | Mar 9 | Nov 17 | 253 d | 9a |
| Port Hadlock | Mar 1 | Nov 28 | 272 d | 8b |
| Port Ludlow | Apr 11 | Oct 28 | 200 d | 8b |
| Port Orchard | Mar 29 | Nov 14 | 230 d | 8b |
| Port Townsend | Mar 1 | Nov 28 | 272 d | 8b |
| Poulsbo | Mar 29 | Nov 14 | 230 d | 8b |
| Prescott | Mar 27 | Oct 31 | 218 d | 7a |
| Preston | Mar 30 | Nov 7 | 222 d | 8b |
| Prosser | Apr 14 | Oct 22 | 191 d | 7b |
| Pullman | May 6 | Sep 29 | 146 d | 6b |
| Puyallup | Apr 11 | Oct 30 | 202 d | 8b |