Florida frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jacksonville | Feb 1 | Jan 5 | 338 d | 9b |
| Jacksonville (Saint Johns) | Feb 1 | Jan 5 | 338 d | 9b |
| Jacksonville Beach | Jan 31 | Jan 10 | 344 d | 9b |
| Jasper | Mar 11 | Nov 22 | 256 d | 9a |
| Jay | Mar 15 | Nov 13 | 243 d | 8b |
| Jennings | Mar 11 | Nov 22 | 256 d | 9a |
| Jensen Beach | rare frost | 10b | ||
| Jupiter | Jan 26 | Jan 16 | 355 d | 10b |