State hub
Connecticut frost dates by weather station
Connecticut has 23 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 5 at Bridgeport Sikorsky Mem Airport to May 11 at Falls Village.
- 23Stations
- Apr 5Earliest last frostBridgeport Sikorsky Mem Airport
- May 11Latest last frostFalls Village
- 216 daysLongest growing seasonBridgeport Sikorsky Mem Airport
| Station | Last spring frost | First fall frost | Growing season | Elevation |
|---|---|---|---|---|
| Ansonia 1 NE | Apr 25 | Oct 17 | 175 days | 136 ft |
| Bakersville | May 8 | Oct 5 | 151 days | 686 ft |
| Barkhamsted | Apr 30 | Oct 17 | 168 days | 710 ft |
| Bridgeport Sikorsky Mem Airport | Apr 5 | Nov 6 | 216 days | 5 ft |
| Burlington | Apr 25 | Oct 18 | 172 days | 505 ft |
| Danbury | Apr 20 | Oct 20 | 181 days | 405 ft |
| Danbury Muni Airport | May 1 | Oct 14 | 166 days | 457 ft |
| Falls Village | May 11 | Oct 4 | 146 days | 550 ft |
| Groton | Apr 8 | Nov 2 | 207 days | 40 ft |
| Groton New London Airport | Apr 16 | Oct 28 | 194 days | 10 ft |
| Hampton | Apr 30 | Oct 15 | 167 days | 490 ft |
| Hartford Bradley Intl Airport | Apr 21 | Oct 16 | 177 days | 190 ft |
| Hartford Brainard Field | Apr 17 | Oct 26 | 191 days | 19 ft |
| Meriden Markham Muni Airport | Apr 26 | Oct 16 | 175 days | 103 ft |
| Mount Carmel | Apr 18 | Oct 26 | 191 days | 180 ft |
| New Haven Tweed Airport | Apr 17 | Oct 27 | 193 days | 3 ft |
| Norfolk 2 SW | May 3 | Oct 11 | 161 days | 1,340 ft |
| Norwich Public Utility Plant | Apr 14 | Oct 24 | 192 days | 20 ft |
| Staffordville | May 7 | Oct 12 | 159 days | 736 ft |
| Stamford 5 N | Apr 17 | Oct 23 | 188 days | 190 ft |
| Storrs | Apr 19 | Oct 22 | 186 days | 665 ft |
| W Thompson Lake | May 1 | Oct 9 | 161 days | 360 ft |
| Willimantic Windham Airport | Apr 28 | Oct 13 | 167 days | 247 ft |
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.
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.