Texas frost dates: I
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Idalou | Apr 4 | Nov 2 | 212 d | 7b |
| Imperial | Apr 2 | Nov 3 | 215 d | 8a |
| Industry | Mar 2 | Nov 30 | 273 d | 9a |
| Inez | Feb 4 | Dec 9 | 308 d | 9b |
| Ingleside | Jan 16 | Jan 5 | 354 d | 10a |
| Ingram | Mar 27 | Nov 7 | 225 d | 8b |
| Iola | Mar 16 | Nov 11 | 240 d | 9a |
| Iowa Park | Mar 26 | Nov 9 | 228 d | 8a |
| Ira | Mar 27 | Nov 10 | 228 d | 8a |
| Iraan | Mar 31 | Nov 3 | 217 d | 8b |
| Iredell | Mar 24 | Nov 7 | 228 d | 8b |
| Irene | Mar 13 | Nov 14 | 246 d | 8b |
| Irving | Mar 2 | Nov 29 | 272 d | 8b |
| Italy | Mar 8 | Nov 21 | 258 d | 8b |
| Itasca | Mar 21 | Nov 10 | 234 d | 8b |
| Ivanhoe | Mar 16 | Nov 13 | 242 d | 8a |