Frost dates for Norwood Mem Airport, MA
At Norwood Mem Airport, the median last spring frost (32°F) is Apr 25 and the median first fall frost is Oct 9, for a typical growing season of 167 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 25Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 9First fall frost (median)50% chance of 32°F by this date
- 167 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 25 | May 8 | May 24 |
| 32°F | Apr 9 | Apr 25 | May 11 |
| 28°F | Mar 26 | Apr 8 | Apr 27 |
| 24°F | Mar 12 | Mar 27 | Apr 7 |
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 17 | Sep 30 | Oct 12 |
| 32°F | Sep 28 | Oct 9 | Oct 30 |
| 28°F | Oct 6 | Oct 23 | Nov 9 |
| 24°F | Oct 17 | Nov 4 | Nov 26 |
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 | 122 days | 143 days | 163 days |
| 32°F | 145 days | 167 days | 191 days |
| 28°F | 173 days | 197 days | 220 days |
| 24°F | 202 days | 224 days | 250 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 |
|---|---|---|---|
| 02062 | 6b | -5 to 0°F | 2 km |
| 02090 | 6b | -5 to 0°F | 5 km |
| 02026 | 6b | -5 to 0°F | 6 km |
| 02072 | 6b | -5 to 0°F | 10 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 USW00054704, at 42.1908, -71.1736, elevation 15 m (50 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 139.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Blue Hill COOP (5 km)
- Blue Hill (5 km)
- Walpole 2 (7 km)
- Jamaica Plain (13 km)
- Natick (17 km)
- Brockton (21 km)
- Hingham (22 km)
- Norton W (22 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.