Maryland frost dates: F
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Fairplay | Apr 11 | Oct 28 | 200 d | 7a |
| Fallston | Apr 10 | Oct 30 | 203 d | 7b |
| Faulkner | Apr 17 | Oct 27 | 193 d | 7b |
| Federalsburg | Apr 11 | Oct 30 | 202 d | 7b |
| Finksburg | Apr 19 | Oct 25 | 189 d | 7a |
| Fishing Creek | Mar 29 | Nov 15 | 231 d | 8a |
| Flintstone | Apr 15 | Oct 24 | 192 d | 7a |
| Forest Hill | Apr 3 | Nov 6 | 217 d | 7b |
| Fork | Apr 2 | Nov 7 | 219 d | 7b |
| Fort George G Meade | Apr 10 | Oct 31 | 204 d | 7b |
| Fort Howard | Mar 24 | Nov 21 | 242 d | 8a |
| Fort Washington | Apr 3 | Nov 8 | 219 d | 7b |
| Frederick | Apr 2 | Nov 6 | 218 d | 7a |
| Freeland | Apr 19 | Oct 25 | 189 d | 7a |
| Friendship | Apr 9 | Oct 29 | 203 d | 7b |
| Friendsville | Apr 30 | Oct 18 | 171 d | 6a |
| Frostburg | Apr 29 | Oct 18 | 172 d | 6a |
| Fruitland | Apr 3 | Nov 7 | 218 d | 7b |
| Fulton | Apr 5 | Nov 9 | 218 d | 7b |
| Funkstown | Apr 11 | Oct 28 | 200 d | 7a |