Last frost date in Harrisburg, Pennsylvania
April 15
Average last frost in spring. In an early year (1 in 10) it's over by April 1; in a late year (1 in 10) it comes after May 2.
October 23
Average first frost in fall. 1 year in 10 it comes by October 7.
Source: NOAA U.S. Climate Normals 1991–2020, station Harrisburg 1 NE (USC00363698), 0.9 miles from Harrisburg, elevation 420 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 1 | Apr 15 | May 2 |
| First frost in fall | Oct 7 | Oct 23 | Nov 7 |
Frost-free days in an average year: 189
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 30 | Oct 12 |
| Frost (32°F) | Every year | Apr 15 | Oct 23 |
| Hard freeze (28°F) | Every year | Apr 3 | Nov 5 |
Nights at 32°F or colder in an average year: 111
What to plant now in Harrisburg
- Spring planting calendar for an average last frost around April 10 Harrisburg: April 15
- Fall planting calendar for an average first frost around October 20 Harrisburg: October 23
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
- Mechanicsburg 8 mi · last frost Apr 9
- Elizabethtown 17 mi · last frost Apr 9
- Carlisle 18 mi · last frost Apr 23
- York 23 mi · last frost Apr 26
- Lebanon 25 mi · last frost Apr 20
Updated