Connecticut frost dates: T
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Taconic | May 11 | Oct 4 | 146 d | 6a |
| Taftville | Apr 14 | Oct 24 | 193 d | 6b |
| Tariffville | Apr 21 | Oct 16 | 178 d | 6b |
| Terryville | Apr 25 | Oct 18 | 176 d | 6b |
| Thomaston | Apr 25 | Oct 18 | 176 d | 6a |
| Thompson | May 1 | Oct 9 | 161 d | 6b |
| Tolland | Apr 19 | Oct 22 | 186 d | 6b |
| Torrington | May 8 | Oct 5 | 150 d | 6a |
| Trumbull | Apr 5 | Nov 6 | 215 d | 7a |