Last frost date in Williamsport, Pennsylvania
April 25
Average last frost in spring. In an early year (1 in 10) it's over by April 10; in a late year (1 in 10) it comes after May 12.
October 24
Average first frost in fall. 1 year in 10 it comes by October 8.
Source: NOAA U.S. Climate Normals 1991–2020, station Williamsport 2 (USC00369735), 2.8 miles from Williamsport, elevation 525 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 10 | Apr 25 | May 12 |
| First frost in fall | Oct 8 | Oct 24 | Nov 5 |
Frost-free days in an average year: 181
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 7 | Oct 11 |
| Frost (32°F) | Every year | Apr 25 | Oct 24 |
| Hard freeze (28°F) | Every year | Apr 10 | Nov 4 |
Nights at 32°F or colder in an average year: 118
What to plant now in Williamsport
- Spring planting calendar for an average last frost around April 20 Williamsport: April 25
- Fall planting calendar for an average first frost around October 20 Williamsport: October 24
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Pennsylvania
- Bloomsburg 34 mi · last frost Apr 27
- Berwick 43 mi · last frost May 4
- State College 53 mi · last frost Apr 20
- Nanticoke 54 mi · last frost May 7
- Hazleton 59 mi · last frost Apr 30
Updated