Last frost date in Portland, Maine
April 26
Average last frost in spring. In an early year (1 in 10) it's over by April 16; in a late year (1 in 10) it comes after May 7.
October 15
Average first frost in fall. 1 year in 10 it comes by October 2.
Source: NOAA U.S. Climate Normals 1991–2020, station Portland International Jetport (USW00014764), 5.9 miles from Portland, elevation 45 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Saco, South Portland and Westbrook, so their frost dates are the same as Portland's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 16 | Apr 26 | May 7 |
| First frost in fall | Oct 2 | Oct 15 | Oct 30 |
Frost-free days in an average year: 170
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 7 | Oct 4 |
| Frost (32°F) | Every year | Apr 26 | Oct 15 |
| Hard freeze (28°F) | Every year | Apr 14 | Oct 27 |
Nights at 32°F or colder in an average year: 144
What to plant now in Portland
- Spring planting calendar for an average last frost around April 30 Portland: April 26
- Fall planting calendar for an average first frost around October 10 Portland: October 15
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 Maine
- Biddeford 17 mi · last frost May 9
- Lewiston 32 mi · last frost Apr 25
- Sanford 32 mi · last frost May 16
- Augusta 53 mi · last frost Apr 27
- Waterville 68 mi · last frost May 2
Updated