Frost dates for Plymouth Muni Airport, MA
At Plymouth Muni Airport, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 16, for a typical growing season of 170 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 16First fall frost (median)50% chance of 32°F by this date
- 170 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 29 | May 10 | May 24 |
| 32°F | Apr 19 | Apr 30 | May 12 |
| 28°F | Apr 3 | Apr 18 | May 2 |
| 24°F | Mar 19 | Apr 3 | Apr 18 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 23 | Oct 5 | Oct 19 |
| 32°F | Oct 3 | Oct 16 | Nov 1 |
| 28°F | Oct 14 | Oct 27 | Nov 11 |
| 24°F | Oct 24 | Nov 7 | Nov 27 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 129 days | 148 days | 167 days |
| 32°F | 153 days | 170 days | 188 days |
| 28°F | 173 days | 192 days | 213 days |
| 24°F | 198 days | 218 days | 242 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 02330 | 6b | -5 to 0°F | 4 km |
| 02367 | 6b | -5 to 0°F | 8 km |
| 02360 | 7a | 0 to 5°F | 9 km |
| 02366 | 6b | -5 to 0°F | 9 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USW00054769, at 41.9097, -70.7294, elevation 45 m (149 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 127.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Plymouth-Kingston (8 km)
- Middleboro (15 km)
- E Wareham (17 km)
- Bridgewater (19 km)
- Rochester (21 km)
- Taunton Muni Airport (24 km)
- Brockton (28 km)
- Taunton (28 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.