Last frost date in Mechanicsburg, Pennsylvania
April 9
Average last frost in spring. In an early year (1 in 10) it's over by March 27; in a late year (1 in 10) it comes after April 25.
November 1
Average first frost in fall. 1 year in 10 it comes by October 16.
Source: NOAA U.S. Climate Normals 1991–2020, station Harrisburg Cptl Cy AP (USW00014751), 8.2 miles from Mechanicsburg, elevation 340 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 27 | Apr 9 | Apr 25 |
| First frost in fall | Oct 16 | Nov 1 | Nov 15 |
Frost-free days in an average year: 205
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 22 | Oct 20 |
| Frost (32°F) | Every year | Apr 9 | Nov 1 |
| Hard freeze (28°F) | Every year | Mar 29 | Nov 12 |
Nights at 32°F or colder in an average year: 102
What to plant now in Mechanicsburg
- Corn saladSept 15 – Nov 1Now
- Upland cressSept 15 – Nov 1Now
- Rhubarb plantsNov 1 – Dec 1Soon
- Asparagus plantsNov 15 – Jan 1Soon
- Spring planting calendar for an average last frost around April 10 Mechanicsburg: April 9
- Fall planting calendar for an average first frost around October 30 Mechanicsburg: November 1
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
- Harrisburg 8 mi · last frost Apr 15
- Carlisle 10 mi · last frost Apr 23
- Elizabethtown 22 mi · last frost Apr 9
- York 22 mi · last frost Apr 26
- Hanover 28 mi · last frost Apr 24
Updated