Washington frost dates: T
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Tacoma | Mar 8 | Nov 14 | 251 d | 8b |
| Taholah | Apr 26 | Oct 22 | 179 d | 8b |
| Tahuya | Mar 24 | Nov 15 | 236 d | 8b |
| Tekoa | May 11 | Oct 5 | 147 d | 6b |
| Tenino | Apr 29 | Oct 14 | 168 d | 8b |
| Thornton | May 7 | Sep 28 | 144 d | 6b |
| Thorp | Apr 28 | Oct 7 | 162 d | 7a |
| Tieton | Apr 8 | Oct 23 | 198 d | 7a |
| Tokeland | Mar 29 | Nov 7 | 223 d | 9b |
| Toledo | Apr 5 | Oct 25 | 203 d | 8a |
| Tonasket | Apr 26 | Oct 10 | 167 d | 6b |
| Toppenish | Apr 21 | Oct 15 | 177 d | 7a |
| Touchet | May 2 | Oct 1 | 152 d | 7a |
| Toutle | Apr 7 | Nov 13 | 220 d | 8a |
| Tracyton | Mar 29 | Nov 14 | 230 d | 9a |
| Trout Lake | May 18 | Sep 25 | 130 d | 7a |
| Tumtum | May 10 | Sep 26 | 139 d | 6b |
| Tumwater | Apr 29 | Oct 14 | 168 d | 8a |
| Twisp | May 15 | Sep 22 | 130 d | 6b |