Frost dates · Pennsylvania
When is the first frost in Philadelphia?
In a typical year, Philadelphia’s first frost comes around November 10 and its last around April 2.
One year in ten the first frost comes as early as October 30, and nine years in ten it has arrived by November 24. One year in ten the last frost is over as early as March 19, and nine years in ten it is over by April 13. Philadelphia averages about 77 nights a year at 32°F or colder, with about 224 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 2. That makes it the 27th latest first frost of the 117 cities we track where it freezes most years.
Last updated
No freeze in the forecast for the next 48 hours.
Philadelphia’s first frost waits until mid-November, which buys the city extra weeks of being outside and opinionated.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | October 30 | November 10 | November 24 |
| Last frost | March 19 | April 2 | April 13 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Little Rock, Arkansas: first frost around November 10
- Newark, New Jersey: first frost around November 10
- Astoria, Oregon: first frost around November 11
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00013739.