Arizona frost dates: F
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Flagstaff | Jun 4 | Sep 28 | 116 d | 6a |
| Florence | Jan 30 | Dec 12 | 316 d | 9b |
| Forest Lakes | May 23 | Oct 5 | 135 d | 6b |
| Fort Apache | May 22 | Oct 6 | 137 d | 7b |
| Fort Defiance | May 29 | Sep 28 | 122 d | 6b |
| Fort Huachuca | Apr 5 | Nov 9 | 218 d | 8b |
| Fort Huachuca (Cochise) | Apr 14 | Nov 2 | 202 d | 8b |
| Fort Mcdowell | Jan 6 | Dec 28 | 356 d | 9b |
| Fort Mohave | Jan 4 | Dec 23 | 353 d | 9b |
| Fort Thomas | Apr 1 | Nov 6 | 219 d | 8b |
| Fountain Hills | Jan 6 | Dec 28 | 356 d | 9b |
| Fredonia | Apr 29 | Oct 22 | 176 d | 7a |