Pennsylvania Frost Dates & Growing Zones by City
Philadelphia is the only Pennsylvania city with frost dates on this site so far. Its typical (50%) last spring frost is Mar 30, and its typical frost-free season is 232 days.
On the 2023 USDA hardiness map, these cities fall in zone 7b.
Each city's dates come from the nearest NOAA station that passes our quality rules. The methodology explains how we pick it.
| City | Last frost (50%) | First frost (50%) | Season (days, 50%) | Zone 2023 | Confidence | Planting calendar |
|---|---|---|---|---|---|---|
| Philadelphia frost dates | Mar 30 | Nov 17 | 232 | 7b | High | Philadelphia planting calendar |
Station match, data and rules: methodology. Long-term odds, not a forecast.