Frost dates for Durham 2 N, NH
At Durham 2 N, the median last spring frost (32°F) is May 3 and the median first fall frost is Oct 10, for a typical growing season of 158 days. For a 90% chance that the last frost has passed, wait until May 16. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 3Last spring frost (median)50% chance of 32°F after this date
- May 16Safer planting date10% chance of 32°F after this date
- Oct 10First fall frost (median)50% chance of 32°F by this date
- 158 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 4 | May 15 | May 28 |
| 32°F | Apr 23 | May 3 | May 16 |
| 28°F | Apr 6 | Apr 20 | May 3 |
| 24°F | Mar 25 | Apr 6 | Apr 19 |
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 29 | Oct 11 |
| 32°F | Sep 27 | Oct 10 | Oct 25 |
| 28°F | Oct 7 | Oct 23 | Nov 6 |
| 24°F | Oct 20 | Nov 4 | Nov 20 |
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 | 118 days | 135 days | 150 days |
| 32°F | 140 days | 158 days | 175 days |
| 28°F | 163 days | 184 days | 203 days |
| 24°F | 192 days | 210 days | 230 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 |
|---|---|---|---|
| 03823 | 6a | -10 to -5°F | 1 km |
| 03820 | 6a | -10 to -5°F | 4 km |
| 03869 | 6a | -10 to -5°F | 9 km |
| 03825 | 6a | -10 to -5°F | 10 km |
| 03903 | 6a | -10 to -5°F | 13 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 USW00054794, at 43.1717, -70.9278, elevation 36 m (119 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 150.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Durham (4 km)
- Durham 2 SSW (7 km)
- Rochester Skyhaven Airport (12 km)
- Greenland (19 km)
- Epping (20 km)
- W Hampstead (37 km)
- Massabesic Lake (43 km)
- Concord Muni Airport (47 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.