Frost dates for Walpole 2s Nepp, NH
At Walpole 2s Nepp, the median last spring frost (32°F) is May 8 and the median first fall frost is Oct 3, for a typical growing season of 149 days. For a 90% chance that the last frost has passed, wait until May 22. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- May 8Last spring frost (median)50% chance of 32°F after this date
- May 22Safer planting date10% chance of 32°F after this date
- Oct 3First fall frost (median)50% chance of 32°F by this date
- 149 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 21 | Jun 6 |
| 32°F | Apr 24 | May 8 | May 22 |
| 28°F | Apr 10 | Apr 25 | May 11 |
| 24°F | Mar 30 | 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 3 | Oct 20 |
| 28°F | Oct 1 | Oct 16 | Nov 3 |
| 24°F | Oct 11 | Oct 30 | 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 | 105 days | 125 days | 146 days |
| 32°F | 129 days | 149 days | 170 days |
| 28°F | 153 days | 175 days | 198 days |
| 24°F | 180 days | 202 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 |
|---|---|---|---|
| 03608 | 5b | -15 to -10°F | 6 km |
| 03467 | 5b | -15 to -10°F | 7 km |
| 05346 | 5b | -15 to -10°F | 8 km |
| 05158 | 5b | -15 to -10°F | 9 km |
| 03604 | 5b | -15 to -10°F | 12 km |
| 03609 | 5b | -15 to -10°F | 12 km |
| 05154 | 5b | -15 to -10°F | 14 km |
| 03602 | 6a | -10 to -5°F | 14 km |
| 05101 | 5b | -15 to -10°F | 15 km |
| 05141 | 5b | -15 to -10°F | 17 km |
| 05345 | 5b | -15 to -10°F | 20 km |
| 05353 | 5b | -15 to -10°F | 21 km |
| 05362 | 5b | -15 to -10°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 USC00278856, at 43.0336, -72.4328, elevation 184 m (604 ft).
- Data quality: Estimated from nearby stations (2+ years), 3 years of freeze data.
- Average days per year at or below 32°F: 163.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Keene (14 km)
- Jaffrey Silver Rch Airpark (43 km)
- Bradford 2 (43 km)
- Jaffrey Muni Airport (43 km)
- Newport (43 km)
- Mount Sunapee (44 km)
- Weare 2 NE (55 km)
- Weare (57 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.