Iowa frost dates: T
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Tabor | Apr 23 | Oct 11 | 171 d | 6a |
| Tama | Apr 30 | Oct 9 | 162 d | 5a |
| Teeds Grove | Apr 13 | Oct 26 | 196 d | 5a |
| Templeton | Apr 27 | Oct 10 | 166 d | 5a |
| Terril | Apr 28 | Oct 11 | 166 d | 5a |
| Thayer | Apr 23 | Oct 17 | 177 d | 5b |
| Thompson | Apr 30 | Oct 7 | 160 d | 5a |
| Thor | Apr 26 | Oct 12 | 169 d | 5a |
| Thornburg | Apr 24 | Oct 15 | 174 d | 5b |
| Thornton | May 3 | Oct 1 | 151 d | 5a |
| Thurman | Apr 19 | Oct 19 | 183 d | 5b |
| Tiffin | Apr 21 | Oct 18 | 180 d | 5b |
| Tingley | Apr 23 | Oct 17 | 177 d | 5b |
| Tipton | Apr 21 | Oct 15 | 177 d | 5a |
| Titonka | Apr 30 | Oct 6 | 159 d | 5a |
| Toddville | Apr 28 | Oct 12 | 167 d | 5a |
| Toeterville | Apr 30 | Oct 9 | 162 d | 5a |
| Toledo | Apr 30 | Oct 9 | 162 d | 5a |
| Tracy | Apr 20 | Oct 19 | 182 d | 5b |
| Traer | Apr 30 | Oct 9 | 162 d | 5a |
| Treynor | Apr 23 | Oct 14 | 174 d | 5b |
| Tripoli | Apr 29 | Oct 9 | 163 d | 5a |
| Troy Mills | May 3 | Oct 7 | 157 d | 5a |
| Truesdale | Apr 25 | Oct 13 | 171 d | 5a |
| Truro | Apr 30 | Oct 3 | 156 d | 5b |