Frost dates across Pennsylvania
Typical last spring frost, first fall frost, and USDA zone for 12 Pennsylvania cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Pennsylvania ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Philadelphia | Mar 30 | Nov 17 | about 232 days | 7b |
| Pittsburgh | Apr 24 | Oct 27 | about 186 days | 6b |
| Allentown | Apr 20 | Oct 24 | about 187 days | 7a |
| Reading | Apr 14 | Oct 29 | about 198 days | 7a |
| Erie | Apr 26 | Nov 4 | about 192 days | 7a |
| Scranton | Apr 23 | Oct 20 | about 180 days | 6b |
| Harrisburg | Apr 15 | Oct 23 | about 191 days | 7a |
| Altoona | Apr 25 | Oct 21 | about 179 days | 6b |
| Williamsport | Apr 25 | Oct 24 | about 182 days | 6a |
| Hermitage | May 15 | Oct 3 | about 141 days | 6a |
| Saint Marys | May 14 | Oct 6 | about 145 days | 5b |
| Waynesboro | Apr 25 | Oct 19 | about 177 days | 7a |
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