Maryland frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jarrettsville | Apr 3 | Nov 6 | 217 d | 7a |
| Jefferson | Apr 2 | Nov 6 | 218 d | 7b |
| Jessup | Apr 10 | Oct 31 | 204 d | 7b |
| Joppa | Apr 10 | Oct 30 | 203 d | 7b |
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jarrettsville | Apr 3 | Nov 6 | 217 d | 7a |
| Jefferson | Apr 2 | Nov 6 | 218 d | 7b |
| Jessup | Apr 10 | Oct 31 | 204 d | 7b |
| Joppa | Apr 10 | Oct 30 | 203 d | 7b |