Ohio frost dates: I
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Iberia | Apr 26 | Oct 20 | 177 d | 6a |
| Independence | Apr 8 | Nov 12 | 218 d | 6b |
| Irondale | Apr 22 | Oct 28 | 189 d | 6b |
| Ironton | Apr 22 | Oct 23 | 184 d | 7a |
| Irwin | Apr 19 | Oct 26 | 190 d | 6a |
| Isle Saint George | Apr 10 | Nov 5 | 209 d | 7a |