Last spring frost
May 25
Frost Dates for Mattawamkeag, ME
First fall frost
Sep 24
Growing season
119 days
Hardiness zone
5a
In an average year around Mattawamkeag, ME, the last spring frost (32°F) is about May 25 and the first fall frost is about Sep 24, giving roughly a 119-day growing season. To be safe most years, wait until May 10 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Jun 20 | Jun 5 | May 24 |
| Freeze (32°F) | Jun 8 | May 25 | May 10 |
| Hard (28°F) | May 27 | May 11 | Apr 27 |
| Severe (24°F) | May 12 | Apr 27 | Apr 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 20 | Jun 15 | Jun 11 | Jun 7 | Jun 5 | Jun 2 | May 30 | May 28 | May 24 |
| 32°F | Jun 8 | Jun 3 | May 31 | May 28 | May 25 | May 22 | May 19 | May 15 | May 10 |
| 28°F | May 27 | May 22 | May 18 | May 14 | May 11 | May 7 | May 4 | May 1 | Apr 27 |
| 24°F | May 12 | May 6 | May 2 | Apr 30 | Apr 27 | Apr 24 | Apr 22 | Apr 17 | Apr 12 |
| 20°F | Apr 28 | Apr 23 | Apr 20 | Apr 17 | Apr 13 | Apr 10 | Apr 8 | Apr 5 | Apr 3 |
| 16°F | Apr 18 | Apr 12 | Apr 9 | Apr 7 | Apr 5 | Apr 3 | Apr 1 | Mar 30 | Mar 25 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Aug 29 | Sep 11 | Sep 26 |
| Freeze (32°F) | Sep 8 | Sep 24 | Oct 5 |
| Hard (28°F) | Sep 22 | Oct 3 | Oct 18 |
| Severe (24°F) | Oct 2 | Oct 14 | Nov 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 29 | Sep 2 | Sep 5 | Sep 8 | Sep 11 | Sep 13 | Sep 17 | Sep 21 | Sep 26 |
| 32°F | Sep 8 | Sep 13 | Sep 17 | Sep 21 | Sep 24 | Sep 26 | Sep 30 | Oct 2 | Oct 5 |
| 28°F | Sep 22 | Sep 26 | Sep 30 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 12 | Oct 18 |
| 24°F | Oct 2 | Oct 6 | Oct 9 | Oct 11 | Oct 14 | Oct 18 | Oct 22 | Oct 26 | Nov 1 |
| 20°F | Oct 13 | Oct 18 | Oct 23 | Oct 26 | Oct 30 | Nov 1 | Nov 4 | Nov 8 | Nov 14 |
| 16°F | Oct 29 | Nov 2 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 22 | Nov 26 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Danforth, Me, about 17.9 miles away@if(!empty($station['elevation_ft'])), at 475 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Mattawamkeag, ME?
On average, the last spring frost (32°F) around Mattawamkeag, ME is about May 25. In cooler years it can run later, so for a safer bet many gardeners wait until May 10.
When is the first frost in the fall?
The first fall frost around Mattawamkeag, ME typically arrives about Sep 24. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around May 25 on average, or May 10 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 119 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 04451 Planting calendar → Maine frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026