Frost dates for Wentworth, NH
At Wentworth, the median last spring frost (32°F) is May 12 and the median first fall frost is Oct 6, for a typical growing season of 146 days. For a 90% chance that the last frost has passed, wait until May 25. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 12Last spring frost (median)50% chance of 32°F after this date
- May 25Safer planting date10% chance of 32°F after this date
- Oct 6First fall frost (median)50% chance of 32°F by this date
- 146 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 11 | May 25 | Jun 9 |
| 32°F | Apr 30 | May 12 | May 25 |
| 28°F | Apr 18 | Apr 30 | May 12 |
| 24°F | Apr 4 | Apr 16 | Apr 28 |
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 26 | Oct 8 |
| 32°F | Sep 23 | Oct 6 | Oct 22 |
| 28°F | Oct 5 | Oct 20 | Nov 4 |
| 24°F | Oct 16 | Nov 1 | 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 | 101 days | 122 days | 141 days |
| 32°F | 126 days | 146 days | 166 days |
| 28°F | 151 days | 172 days | 192 days |
| 24°F | 177 days | 198 days | 216 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 |
|---|---|---|---|
| 03282 | 5a | -20 to -15°F | 1 km |
| 03777 | 5a | -20 to -15°F | 10 km |
| 03266 | 5a | -20 to -15°F | 10 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 USC00279091, at 43.8669, -71.9164, elevation 199 m (653 ft).
- Data quality: Estimated from nearby stations (2+ years), 9 years of freeze data.
- Average days per year at or below 32°F: 178.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Benton 5 SW (19 km)
- Plymouth (23 km)
- Lincoln Nepp (28 km)
- Grafton (33 km)
- Waterville Valley Nepp (34 km)
- Hanover (35 km)
- Meredith 3 NNE (40 km)
- Lebanon Muni Airport (41 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.