New Jersey frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jackson | Apr 23 | Oct 20 | 180 d | 7a |
| Jersey City | Apr 4 | Nov 6 | 216 d | 7b |
| Jobstown | Apr 15 | Oct 29 | 197 d | 7b |
| Johnsonburg | Apr 25 | Oct 19 | 177 d | 6b |
| Joint Base Mdl | Apr 17 | Oct 28 | 194 d | 7a |
| Juliustown | Apr 15 | Oct 29 | 197 d | 7b |