Frost dates for Greenville 1 NNE, NH
At Greenville 1 NNE, the median last spring frost (32°F) is May 10 and the median first fall frost is Oct 6, for a typical growing season of 147 days. For a 90% chance that the last frost has passed, wait until May 27. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 10Last spring frost (median)50% chance of 32°F after this date
- May 27Safer planting date10% chance of 32°F after this date
- Oct 6First fall frost (median)50% chance of 32°F by this date
- 147 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 7 | May 23 | Jun 9 |
| 32°F | Apr 26 | May 10 | May 27 |
| 28°F | Apr 12 | Apr 26 | May 13 |
| 24°F | Mar 31 | 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 13 | Sep 28 | Oct 8 |
| 32°F | Sep 25 | Oct 6 | Oct 21 |
| 28°F | Oct 2 | Oct 18 | Nov 3 |
| 24°F | Oct 16 | Nov 1 | Nov 19 |
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 | 145 days |
| 32°F | 128 days | 147 days | 168 days |
| 28°F | 152 days | 174 days | 198 days |
| 24°F | 182 days | 204 days | 226 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 |
|---|---|---|---|
| 03048 | 6a | -10 to -5°F | 5 km |
| 03086 | 6a | -10 to -5°F | 6 km |
| 03071 | 6a | -10 to -5°F | 7 km |
| 03084 | 6a | -10 to -5°F | 8 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 USC00273658, at 42.7828, -71.7986, elevation 274 m (900 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 157.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Milford (14 km)
- E Milford (15 km)
- Jaffrey Muni Airport (17 km)
- Jaffrey Silver Rch Airpark (17 km)
- Nashua Cwsu (27 km)
- Nashua 2 NNW (27 km)
- Hudson 1 SSE (31 km)
- Manchester Airport (34 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.