Frost dates for Epping, NH
At Epping, the median last spring frost (32°F) is May 7 and the median first fall frost is Oct 4, for a typical growing season of 148 days. For a 90% chance that the last frost has passed, wait until May 21. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 7Last spring frost (median)50% chance of 32°F after this date
- May 21Safer planting date10% chance of 32°F after this date
- Oct 4First fall frost (median)50% chance of 32°F by this date
- 148 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 6 | May 19 | Jun 1 |
| 32°F | Apr 25 | May 7 | May 21 |
| 28°F | Apr 10 | Apr 24 | May 8 |
| 24°F | Mar 29 | Apr 9 | Apr 23 |
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 12 | Sep 25 | Oct 6 |
| 32°F | Sep 22 | Oct 4 | Oct 17 |
| 28°F | Oct 1 | Oct 15 | Nov 1 |
| 24°F | Oct 12 | Oct 30 | Nov 15 |
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 | 108 days | 127 days | 144 days |
| 32°F | 130 days | 148 days | 166 days |
| 28°F | 152 days | 172 days | 194 days |
| 24°F | 180 days | 201 days | 221 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 |
|---|---|---|---|
| 03042 | 6a | -10 to -5°F | 2 km |
| 03044 | 6a | -10 to -5°F | 4 km |
| 03077 | 6a | -10 to -5°F | 10 km |
| 03833 | 6a | -10 to -5°F | 10 km |
| 03290 | 6a | -10 to -5°F | 12 km |
| 03827 | 6a | -10 to -5°F | 16 km |
| 03037 | 6a | -10 to -5°F | 18 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 USC00272800, at 43.0303, -71.0839, elevation 49 m (160 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 154.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Durham 2 SSW (14 km)
- W Hampstead (16 km)
- Durham (17 km)
- Durham 2 N (20 km)
- Greenland (21 km)
- Massabesic Lake (26 km)
- Rochester Skyhaven Airport (31 km)
- Manchester Airport (31 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.