Frost dates · Maine
When is the first frost in Portland, Maine?
In a typical year, Portland, Maine’s first frost comes around October 15 and its last around April 26.
One year in ten the first frost comes as early as October 2, and nine years in ten it has arrived by October 30. One year in ten the last frost is over as early as April 16, and nine years in ten it is over by May 7. Portland, Maine averages about 144 nights a year at 32°F or colder, with about 170 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 26. That makes it the 30th earliest first frost of the 117 cities we track where it freezes most years.
Last updated
No freeze in the forecast for the next 48 hours.
Portland’s first frost turns up in mid-October, just as the lobster rolls start feeling seasonal.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | October 2 | October 15 | October 30 |
| Last frost | April 16 | April 26 | May 7 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Albany, New York: first frost around October 15
- Burlington, Vermont: first frost around October 15
- Grand Junction, Colorado: first frost around October 16
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014764.