Last spring frost
Apr 25
Frost Dates for Nahant, MA
First fall frost
Oct 20
Growing season
176 days
Hardiness zone
7a
In an average year around Nahant, MA, the last spring frost (32°F) is about Apr 25 and the first fall frost is about Oct 20, giving roughly a 176-day growing season. To be safe most years, wait until Apr 12 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 9 | Apr 26 |
| Freeze (32°F) | May 13 | Apr 25 | Apr 12 |
| Hard (28°F) | Apr 27 | Apr 11 | Apr 1 |
| Severe (24°F) | Apr 12 | Mar 31 | Mar 18 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 26 | May 20 | May 17 | May 13 | May 9 | May 6 | May 3 | May 1 | Apr 26 |
| 32°F | May 13 | May 5 | May 1 | Apr 29 | Apr 25 | Apr 23 | Apr 19 | Apr 17 | Apr 12 |
| 28°F | Apr 27 | Apr 21 | Apr 17 | Apr 14 | Apr 11 | Apr 9 | Apr 6 | Apr 4 | Apr 1 |
| 24°F | Apr 12 | Apr 7 | Apr 4 | Apr 2 | Mar 31 | Mar 29 | Mar 26 | Mar 22 | Mar 18 |
| 20°F | Apr 3 | Mar 31 | Mar 29 | Mar 25 | Mar 21 | Mar 19 | Mar 16 | Mar 13 | Mar 8 |
| 16°F | Mar 28 | Mar 22 | Mar 19 | Mar 16 | Mar 13 | Mar 11 | Mar 8 | Mar 5 | Feb 28 |
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 28 | Oct 9 | Oct 23 |
| Freeze (32°F) | Oct 5 | Oct 20 | Nov 3 |
| Hard (28°F) | Oct 17 | Oct 31 | Nov 15 |
| Severe (24°F) | Oct 28 | Nov 12 | Nov 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 9 | Oct 12 | Oct 15 | Oct 18 | Oct 23 |
| 32°F | Oct 5 | Oct 11 | Oct 14 | Oct 18 | Oct 20 | Oct 23 | Oct 25 | Oct 30 | Nov 3 |
| 28°F | Oct 17 | Oct 22 | Oct 26 | Oct 29 | Oct 31 | Nov 2 | Nov 5 | Nov 9 | Nov 15 |
| 24°F | Oct 28 | Nov 2 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 17 | Nov 21 | Nov 28 |
| 20°F | Nov 6 | Nov 13 | Nov 17 | Nov 21 | Nov 24 | Nov 27 | Dec 1 | Dec 4 | Dec 10 |
| 16°F | Nov 20 | Nov 26 | Nov 30 | Dec 2 | Dec 4 | Dec 8 | Dec 12 | Dec 17 | Dec 23 |
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: Marblehead, Ma, about 5.9 miles away@if(!empty($station['elevation_ft'])), at 84 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 Nahant, MA?
On average, the last spring frost (32°F) around Nahant, MA is about Apr 25. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 12.
When is the first frost in the fall?
The first fall frost around Nahant, MA typically arrives about Oct 20. 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 Apr 25 on average, or Apr 12 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 176 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 01908 Planting calendar → Massachusetts frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026