Pennsylvania frost dates: Z
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Zelienople | Apr 27 | Oct 25 | 181 d | 6b |
| Zieglerville | Apr 20 | Oct 23 | 186 d | 7a |
| Zion Grove | Apr 30 | Oct 22 | 175 d | 6b |
| Zionhill | Apr 21 | Oct 22 | 184 d | 7a |
| Zionsville | Apr 26 | Oct 14 | 171 d | 7a |
| Zullinger | Apr 7 | Nov 4 | 211 d | 7a |