Pennsylvania climate almanac
Pennsylvania's climate, read through its 57 NOAA stations, is mainly mild humid continental (northeast, midwest, pacific northwest). The mean frost-free season runs from about April 30 to October 18, roughly 169 days.
Stations 57 NOAA 1991-2020 normals
Mean frost-free season 169 days 130 to 224 across the state
Typical frost window April 30 - October 18 Median last and first frost
Main climate types 1 Mild humid continental (Northeast, Midwest, Pacific Northwest) (57)
What this means for your home
In Pennsylvania, the difference between the shortest and longest frost-free pockets is 94 days. That is the difference between a tomato crop that struggles and one that runs into October, between one fertilizer timing and another. Set your place above to tune every date to your nearest station.
Major cities in Pennsylvania
Pick a city to see its frost and planting dates, or set your own place above.