Ohio frost dates: T
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Tallmadge | Apr 30 | Oct 21 | 174 d | 6b |
| Tarlton | Apr 17 | Oct 28 | 194 d | 6a |
| Terrace Park | Apr 23 | Oct 18 | 178 d | 6b |
| The Plains | Apr 25 | Oct 23 | 181 d | 6b |
| Thompson | May 5 | Oct 18 | 166 d | 6a |
| Thornville | Apr 22 | Oct 18 | 179 d | 6a |
| Thurman | Apr 30 | Oct 15 | 168 d | 6b |
| Thurston | Apr 26 | Oct 13 | 170 d | 6b |
| Tiffin | Apr 23 | Oct 23 | 183 d | 6a |
| Tiltonsville | Apr 18 | Nov 1 | 197 d | 7a |
| Tipp City | Apr 16 | Oct 28 | 195 d | 6a |
| Tippecanoe | Apr 29 | Oct 15 | 169 d | 6b |
| Tiro | Apr 19 | Oct 27 | 191 d | 6a |
| Toledo | Apr 20 | Oct 27 | 190 d | 6b |
| Tontogany | Apr 22 | Oct 25 | 186 d | 6b |
| Toronto | Apr 22 | Oct 28 | 189 d | 6b |
| Tremont City | Apr 25 | Oct 19 | 177 d | 6a |
| Trenton | Apr 22 | Oct 18 | 179 d | 6b |
| Trimble | Apr 25 | Oct 23 | 181 d | 6b |
| Trinway | Apr 27 | Oct 18 | 174 d | 6a |
| Troy | Apr 18 | Oct 23 | 188 d | 6a |
| Tuppers Plains | Apr 14 | Oct 30 | 199 d | 6b |
| Tuscarawas | Apr 29 | Oct 15 | 169 d | 6b |
| Twinsburg | Apr 30 | Oct 21 | 174 d | 6a |