South Dakota frost dates: T
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Tabor | May 1 | Oct 7 | 159 d | 5a |
| Tea | Apr 26 | Oct 13 | 170 d | 5a |
| Timber Lake | May 10 | Sep 30 | 143 d | 4b |
| Tolstoy | May 7 | Oct 2 | 148 d | 4b |
| Toronto | May 6 | Oct 3 | 150 d | 4b |
| Trail City | May 3 | Oct 8 | 158 d | 4b |
| Trent | May 1 | Oct 4 | 156 d | 4b |
| Tripp | May 1 | Oct 7 | 159 d | 5a |
| Tulare | May 8 | Oct 1 | 146 d | 4b |
| Turton | May 7 | Oct 3 | 149 d | 4b |
| Tuthill | May 14 | Oct 1 | 140 d | 5a |
| Twin Brooks | May 2 | Oct 4 | 155 d | 4b |
| Tyndall | May 1 | Oct 7 | 159 d | 5a |