Frost dates · Pennsylvania
When is the first frost in Harrisburg?
In a typical year, Harrisburg’s first frost comes around November 2 and its last around April 9.
One year in ten the first frost comes as early as October 18, and nine years in ten it has arrived by November 15. One year in ten the last frost is over as early as March 28, and nine years in ten it is over by April 25. Harrisburg averages about 101 nights a year at 32°F or colder, with about 206 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 9. That makes it the 47th 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.
Harrisburg holds off on frost until November, which is about the most relaxed thing the place does.
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 18 | November 2 | November 15 |
| Last frost | March 28 | April 9 | April 25 |
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
- Knoxville, Tennessee: first frost around November 2
- Lubbock, Texas: first frost around November 2
- Oklahoma City, Oklahoma: first frost around November 2
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014711.