Frost dates for Maynard 2, MA
At Maynard 2, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 6, for a typical growing season of 156 days. For a 90% chance that the last frost has passed, wait until May 16. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 16Safer planting date10% chance of 32°F after this date
- Oct 6First fall frost (median)50% chance of 32°F by this date
- 156 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 30 | May 13 | May 27 |
| 32°F | Apr 22 | May 2 | May 16 |
| 28°F | Apr 8 | Apr 21 | May 5 |
| 24°F | Mar 28 | Apr 6 | Apr 20 |
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 14 | Sep 27 | Oct 8 |
| 32°F | Sep 25 | Oct 6 | Oct 22 |
| 28°F | Oct 2 | Oct 18 | Nov 3 |
| 24°F | Oct 14 | Nov 1 | Nov 14 |
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 | 119 days | 136 days | 154 days |
| 32°F | 137 days | 156 days | 174 days |
| 28°F | 157 days | 178 days | 199 days |
| 24°F | 184 days | 205 days | 223 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 |
|---|---|---|---|
| 01754 | 6b | -5 to 0°F | 1 km |
| 01776 | 6b | -5 to 0°F | 5 km |
| 01775 | 6b | -5 to 0°F | 6 km |
| 01720 | 6b | -5 to 0°F | 6 km |
| 01719 | 6a | -10 to -5°F | 9 km |
| 01749 | 6b | -5 to 0°F | 10 km |
| 01752 | 6b | -5 to 0°F | 12 km |
| 01460 | 6a | -10 to -5°F | 13 km |
| 01451 | 6a | -10 to -5°F | 13 km |
| 01740 | 6b | -5 to 0°F | 13 km |
| 01503 | 6b | -5 to 0°F | 16 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 USC00194580, at 42.4292, -71.4425, elevation 62 m (205 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 147.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bedford Hanscom Field (13 km)
- Bedford (14 km)
- Natick (18 km)
- Lowell (24 km)
- Reading (28 km)
- Fitchburg Muni Airport (29 km)
- Jamaica Plain (30 km)
- West Medway (33 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.