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Frost dates and growing zones in Pennsylvania
Towns covered so far in Pennsylvania fall in USDA zones 6b, 7a, 7b. Median dates mean frost comes later (spring) or earlier (fall) in half of years.
Towns
| Town | Zone | Median last frost | Median first frost |
|---|---|---|---|
| Philadelphia | 7b | Mar 30 | Nov 17 |
| Pittsburgh | 6b | May 2 | Oct 20 |
| Allentown | 7a | Apr 20 | Oct 24 |
| Reading | 7a | Apr 26 | Oct 19 |
| Erie | 6b | Apr 26 | Nov 4 |
| Lancaster | 7a | Apr 19 | Oct 24 |
| Harrisburg | 7a | Apr 15 | Oct 23 |
| York | 7a | Apr 26 | Oct 19 |
| Easton | 7a | Apr 20 | Oct 24 |