Frost dates for Hampton, CT
At Hampton, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 15, for a typical growing season of 167 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 15First fall frost (median)50% chance of 32°F by this date
- 167 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 | Apr 29 | May 10 | May 23 |
| 32°F | Apr 18 | Apr 30 | May 11 |
| 28°F | Apr 4 | Apr 16 | Apr 30 |
| 24°F | Mar 20 | Apr 3 | Apr 17 |
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 22 | Oct 3 | Oct 16 |
| 32°F | Oct 1 | Oct 15 | Oct 29 |
| 28°F | Oct 13 | Oct 28 | Nov 9 |
| 24°F | Oct 25 | Nov 7 | Nov 24 |
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 | 128 days | 146 days | 162 days |
| 32°F | 149 days | 167 days | 187 days |
| 28°F | 174 days | 193 days | 210 days |
| 24°F | 198 days | 217 days | 238 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 |
|---|---|---|---|
| 06247 | 6b | -5 to 0°F | 2 km |
| 06235 | 6b | -5 to 0°F | 7 km |
| 06234 | 6b | -5 to 0°F | 9 km |
| 06331 | 6b | -5 to 0°F | 9 km |
| 06387 | 6b | -5 to 0°F | 12 km |
| 06350 | 6b | -5 to 0°F | 13 km |
| 06332 | 6b | -5 to 0°F | 13 km |
| 06242 | 6b | -5 to 0°F | 15 km |
| 06374 | 6b | -5 to 0°F | 15 km |
| 06354 | 6b | -5 to 0°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 USC00063420, at 41.7675, -72.0531, elevation 149 m (490 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 142.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Willimantic Windham Airport (11 km)
- Storrs (15 km)
- W Thompson Lake (23 km)
- Norwich Public Utility Plant (27 km)
- Staffordville (31 km)
- Groton (46 km)
- Groton New London Airport (49 km)
- Hartford Brainard Field (50 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.