Frost dates for Bradford 2, NH
At Bradford 2, the median last spring frost (32°F) is May 15 and the median first fall frost is Sep 27, for a typical growing season of 135 days. For a 90% chance that the last frost has passed, wait until May 29. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- May 15Last spring frost (median)50% chance of 32°F after this date
- May 29Safer planting date10% chance of 32°F after this date
- Sep 27First fall frost (median)50% chance of 32°F by this date
- 135 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 | May 14 | May 29 | Jun 11 |
| 32°F | Apr 30 | May 15 | May 29 |
| 28°F | Apr 19 | May 1 | May 17 |
| 24°F | Apr 4 | Apr 17 | May 1 |
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 6 | Sep 17 | Oct 1 |
| 32°F | Sep 15 | Sep 27 | Oct 9 |
| 28°F | Sep 25 | Oct 8 | Oct 27 |
| 24°F | Oct 5 | Oct 23 | Nov 9 |
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 | 92 days | 111 days | 130 days |
| 32°F | 115 days | 135 days | 155 days |
| 28°F | 139 days | 158 days | 180 days |
| 24°F | 163 days | 189 days | 210 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 |
|---|---|---|---|
| 03221 | 5b | -15 to -10°F | 3 km |
| 03273 | 5b | -15 to -10°F | 8 km |
| 03280 | 6a | -10 to -5°F | 11 km |
| 03456 | 6a | -10 to -5°F | 21 km |
| 03464 | 6a | -10 to -5°F | 22 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 USC00270913, at 43.2589, -72.0022, elevation 248 m (815 ft).
- Data quality: Estimated from nearby stations (2+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 176.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mount Sunapee (10 km)
- Newport (20 km)
- Hopkinton Lake (22 km)
- Salisbury (24 km)
- Weare 2 NE (27 km)
- Weare (29 km)
- Grafton (34 km)
- Franklin Falls Dam (37 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.