Pennsylvania frost dates: Y
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Yatesboro | May 10 | Oct 12 | 155 d | 6a |
| Yeagertown | Apr 21 | Oct 24 | 186 d | 7a |
| York | Apr 26 | Oct 19 | 176 d | 7a |
| York Haven | Apr 9 | Nov 2 | 207 d | 7a |
| York New Salem | Apr 26 | Oct 19 | 176 d | 7a |
| York Springs | Apr 15 | Oct 27 | 195 d | 7a |
| Youngstown | May 1 | Oct 13 | 165 d | 6b |
| Youngsville | May 22 | Sep 30 | 131 d | 5b |
| Youngwood | May 1 | Oct 13 | 165 d | 6b |
| Yukon | May 1 | Oct 13 | 165 d | 6b |