Last spring frost
May 3
Frost Dates for Mechanic Falls, ME
First fall frost
Oct 7
Growing season
157 days
Hardiness zone
5b
In an average year around Mechanic Falls, ME, the last spring frost (32°F) is about May 3 and the first fall frost is about Oct 7, giving roughly a 157-day growing season. To be safe most years, wait until Apr 23 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) | May 28 | May 15 | May 3 |
| Freeze (32°F) | May 16 | May 3 | Apr 23 |
| Hard (28°F) | May 1 | Apr 21 | Apr 10 |
| Severe (24°F) | Apr 21 | Apr 10 | Apr 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 28 | May 24 | May 20 | May 17 | May 15 | May 12 | May 9 | May 7 | May 3 |
| 32°F | May 16 | May 11 | May 8 | May 5 | May 3 | May 1 | Apr 29 | Apr 26 | Apr 23 |
| 28°F | May 1 | Apr 28 | Apr 25 | Apr 23 | Apr 21 | Apr 19 | Apr 17 | Apr 13 | Apr 10 |
| 24°F | Apr 21 | Apr 18 | Apr 15 | Apr 12 | Apr 10 | Apr 8 | Apr 6 | Apr 4 | Apr 1 |
| 20°F | Apr 12 | Apr 8 | Apr 6 | Apr 4 | Apr 2 | Apr 1 | Mar 31 | Mar 26 | Mar 20 |
| 16°F | Apr 4 | Apr 2 | Mar 31 | Mar 28 | Mar 24 | Mar 21 | Mar 19 | Mar 16 | Mar 12 |
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) | Sep 16 | Sep 29 | Oct 9 |
| Freeze (32°F) | Sep 27 | Oct 7 | Oct 23 |
| Hard (28°F) | Oct 5 | Oct 22 | Nov 5 |
| Severe (24°F) | Oct 20 | Nov 4 | Nov 18 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 16 | Sep 20 | Sep 23 | Sep 26 | Sep 29 | Oct 1 | Oct 2 | Oct 5 | Oct 9 |
| 32°F | Sep 27 | Sep 30 | Oct 2 | Oct 4 | Oct 7 | Oct 10 | Oct 13 | Oct 17 | Oct 23 |
| 28°F | Oct 5 | Oct 10 | Oct 15 | Oct 19 | Oct 22 | Oct 25 | Oct 29 | Nov 1 | Nov 5 |
| 24°F | Oct 20 | Oct 27 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 10 | Nov 14 | Nov 18 |
| 20°F | Nov 3 | Nov 7 | Nov 11 | Nov 13 | Nov 17 | Nov 19 | Nov 21 | Nov 25 | Nov 29 |
| 16°F | Nov 13 | Nov 17 | Nov 21 | Nov 24 | Nov 26 | Nov 29 | Dec 1 | Dec 4 | Dec 10 |
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: Poland, Me, about 7.1 miles away@if(!empty($station['elevation_ft'])), at 570 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 Mechanic Falls, ME?
On average, the last spring frost (32°F) around Mechanic Falls, ME is about May 3. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 23.
When is the first frost in the fall?
The first fall frost around Mechanic Falls, ME typically arrives about Oct 7. 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 3 on average, or Apr 23 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 157 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 04256 Planting calendar → Maine frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026