Pennsylvania frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jackson | May 14 | Oct 2 | 141 d | 5b |
| Jackson Center | May 15 | Oct 3 | 141 d | 6a |
| Jacobs Creek | Apr 27 | Oct 22 | 178 d | 6b |
| James City | May 24 | Sep 28 | 127 d | 5b |
| James Creek | Apr 19 | Oct 28 | 192 d | 6b |
| Jamestown | May 4 | Oct 14 | 163 d | 6a |
| Jamison | Apr 11 | Nov 1 | 204 d | 7a |
| Jeannette | Apr 22 | Oct 25 | 186 d | 6b |
| Jefferson | May 3 | Oct 15 | 165 d | 6b |
| Jenkintown | Apr 4 | Nov 7 | 217 d | 7b |
| Jenners | May 6 | Oct 12 | 159 d | 6a |
| Jennerstown | May 6 | Oct 12 | 159 d | 6a |
| Jermyn | May 14 | Oct 1 | 140 d | 6a |
| Jerome | May 6 | Oct 12 | 159 d | 6a |
| Jersey Mills | Apr 30 | Oct 20 | 173 d | 6a |
| Jersey Shore | Apr 30 | Oct 22 | 175 d | 6a |
| Jersey Shore (Lycoming) | Apr 30 | Oct 20 | 173 d | 6a |
| Jessup | Apr 23 | Oct 20 | 180 d | 6a |
| Jim Thorpe | Apr 21 | Oct 23 | 185 d | 6b |
| Joffre | Apr 23 | Oct 23 | 183 d | 6b |
| Johnsonburg | May 14 | Oct 6 | 145 d | 5b |
| Johnstown | Apr 29 | Oct 21 | 175 d | 6b |
| Jones Mills | Apr 30 | Oct 17 | 170 d | 6a |
| Jonestown | Apr 20 | Oct 25 | 188 d | 7a |
| Josephine | May 8 | Oct 13 | 158 d | 6b |
| Julian | Apr 20 | Oct 26 | 189 d | 6b |
| Junedale | Apr 30 | Oct 22 | 175 d | 6b |