Frost dates for Brockton, MA
At Brockton, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 19, for a typical growing season of 178 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 178 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 24 | May 5 | May 18 |
| 32°F | Apr 8 | Apr 22 | May 5 |
| 28°F | Mar 27 | Apr 6 | Apr 20 |
| 24°F | Mar 12 | Mar 27 | Apr 8 |
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 26 | Oct 7 | Oct 22 |
| 32°F | Oct 5 | Oct 19 | Nov 3 |
| 28°F | Oct 16 | Oct 31 | Nov 15 |
| 24°F | Oct 29 | Nov 12 | Dec 1 |
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 | 139 days | 155 days | 172 days |
| 32°F | 158 days | 178 days | 198 days |
| 28°F | 184 days | 205 days | 226 days |
| 24°F | 210 days | 230 days | 253 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 |
|---|---|---|---|
| 02379 | 6b | -5 to 0°F | 3 km |
| 02301 | 6b | -5 to 0°F | 4 km |
| 02302 | 6b | -5 to 0°F | 5 km |
| 02333 | 6b | -5 to 0°F | 6 km |
| 02357 | 6b | -5 to 0°F | 6 km |
| 02382 | 6b | -5 to 0°F | 7 km |
| 02375 | 6b | -5 to 0°F | 7 km |
| 02351 | 6b | -5 to 0°F | 9 km |
| 02343 | 6b | -5 to 0°F | 10 km |
| 02341 | 6b | -5 to 0°F | 12 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 USC00190860, at 42.0475, -71.0081, elevation 23 m (75 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 129.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bridgewater (11 km)
- Norton W (14 km)
- NWS Boston/norton (15 km)
- Taunton (17 km)
- Taunton Muni Airport (19 km)
- Middleboro (20 km)
- Blue Hill COOP (20 km)
- Blue Hill (20 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.