Ohio frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jackson | Apr 22 | Oct 21 | 182 d | 6b |
| Jackson Center | Apr 22 | Oct 27 | 188 d | 6a |
| Jacksontown | Apr 22 | Oct 18 | 179 d | 6a |
| Jacksonville | Apr 25 | Oct 23 | 181 d | 6b |
| Jacobsburg | Apr 26 | Oct 21 | 178 d | 6b |
| Jamestown | Apr 18 | Oct 24 | 189 d | 6b |
| Jasper | Apr 21 | Oct 22 | 184 d | 6b |
| Jefferson | May 2 | Oct 21 | 172 d | 6a |
| Jeffersonville | Apr 23 | Oct 21 | 181 d | 6a |
| Jenera | Apr 19 | Oct 23 | 187 d | 6a |
| Jeromesville | Apr 30 | Oct 15 | 168 d | 6a |
| Jerry City | Apr 22 | Oct 25 | 186 d | 6a |
| Jerusalem | Apr 27 | Oct 22 | 178 d | 6b |
| Jewell | Apr 22 | Oct 24 | 185 d | 6a |
| Jewett | Apr 21 | Oct 25 | 187 d | 6b |
| Johnstown | Apr 27 | Oct 17 | 173 d | 6a |
| Junction City | Apr 30 | Oct 17 | 170 d | 6a |