Michigan frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jackson | May 1 | Oct 14 | 166 d | 6a |
| Jamestown | May 6 | Oct 10 | 157 d | 6a |
| Jasper | Apr 27 | Oct 20 | 176 d | 6a |
| Jeddo | May 12 | Oct 5 | 146 d | 6a |
| Jenison | May 6 | Oct 10 | 157 d | 6a |
| Jerome | May 3 | Oct 12 | 162 d | 6a |
| Johannesburg | May 11 | Oct 6 | 148 d | 5a |
| Jones | Apr 30 | Oct 17 | 170 d | 6a |
| Jonesville | May 3 | Oct 12 | 162 d | 6a |