Last spring frost
May 1
Frost Dates for Mechanic Falls, ME
First fall frost
Oct 10
Growing season
162 days
Hardiness zone
5b
In an average year around Mechanic Falls, ME, the last spring frost (32°F) is about May 1 and the first fall frost is about Oct 10, giving roughly a 162-day growing season. To be safe most years, wait until Apr 19 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 26 | May 13 | May 2 |
| Freeze (32°F) | May 13 | May 1 | Apr 19 |
| Hard (28°F) | Apr 30 | Apr 19 | Apr 6 |
| Severe (24°F) | Apr 20 | Apr 7 | Mar 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 26 | May 21 | May 18 | May 15 | May 13 | May 10 | May 8 | May 5 | May 2 |
| 32°F | May 13 | May 9 | May 5 | May 3 | May 1 | Apr 29 | Apr 27 | Apr 24 | Apr 19 |
| 28°F | Apr 30 | Apr 27 | Apr 24 | Apr 21 | Apr 19 | Apr 16 | Apr 13 | Apr 9 | Apr 6 |
| 24°F | Apr 20 | Apr 15 | Apr 12 | Apr 9 | Apr 7 | Apr 5 | Apr 3 | Apr 2 | Mar 29 |
| 20°F | Apr 9 | Apr 6 | Apr 5 | Apr 3 | Apr 1 | Mar 31 | Mar 28 | Mar 24 | Mar 19 |
| 16°F | Apr 5 | Apr 2 | Mar 30 | Mar 27 | Mar 24 | Mar 21 | Mar 19 | Mar 16 | Mar 11 |
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 17 | Sep 30 | Oct 12 |
| Freeze (32°F) | Sep 29 | Oct 10 | Oct 27 |
| Hard (28°F) | Oct 9 | Oct 25 | Nov 8 |
| Severe (24°F) | Oct 25 | Nov 7 | Nov 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 17 | Sep 22 | Sep 25 | Sep 28 | Sep 30 | Oct 1 | Oct 4 | Oct 7 | Oct 12 |
| 32°F | Sep 29 | Oct 2 | Oct 5 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 20 | Oct 27 |
| 28°F | Oct 9 | Oct 14 | Oct 18 | Oct 22 | Oct 25 | Oct 28 | Nov 1 | Nov 4 | Nov 8 |
| 24°F | Oct 25 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 12 | Nov 16 | Nov 21 |
| 20°F | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 24 | Nov 26 | Dec 1 |
| 16°F | Nov 13 | Nov 17 | Nov 21 | Nov 24 | Nov 27 | Nov 30 | Dec 1 | Dec 5 | Dec 11 |
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: Turner, Me, about 9 miles away@if(!empty($station['elevation_ft'])), at 565 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 1. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 19.
When is the first frost in the fall?
The first fall frost around Mechanic Falls, ME typically arrives about Oct 10. 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 1 on average, or Apr 19 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 162 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 04238 Planting calendar → Maine frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026