Frost dates for Harrisburg 1 Ne, PA
At this NOAA station the last spring frost (32°F) usually comes by April 15 and the first fall frost around October 23, giving a growing season of about 189 days.
April 15average last spring frost
October 23average first fall frost
JanAprJulOctDec
Frost odds
| 1 year in 10 the last spring frost is later than | May 2 |
| Half of years the last spring frost is later than | April 15 |
| 9 years in 10 the last spring frost is later than | April 1 |
| 1 year in 10 the first fall frost is earlier than | October 7 |
| Half of years the first fall frost is earlier than | October 23 |
| 9 years in 10 the first fall frost is earlier than | November 7 |
A hard freeze (28°F) usually ends by April 3 and returns around November 5.
A light frost (36°F, which can still nip tender plants) usually ends by April 30 and returns around October 12.
Station USC00363698, elevation 128 m. Based on 22 years of 1991 to 2020 records. A garden higher up, in a hollow or far from this station can freeze later in spring.
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Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026