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Connecticut frost dates by weather station
22 NOAA stations with 1991-2020 freeze normals (standard or representative quality). Last verified 2026-10-17. Dates are for the station; your garden may differ.
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See the sources directory for this state's Extension planting guidance.
| Station | Elev. (ft) | Median last 32°F | 10% risk last 32°F | Median first 32°F | Freeze-free days (median) | Years |
|---|---|---|---|---|---|---|
| Bakersville | 686 | May 8 | May 22 | Oct 5 | 151 | 29 |
| Barkhamsted | 710 | Apr 30 | May 15 | Oct 17 | 168 | 10 |
| Bridgeport Sikorsky Mem AP | 5 | Apr 5 | Apr 17 | Nov 6 | 216 | 30 |
| Burlington | 505 | Apr 25 | May 10 | Oct 18 | 172 | 24 |
| Danbury | 405 | Apr 20 | May 6 | Oct 20 | 181 | 25 |
| Danbury Muni AP | 457 | May 1 | May 16 | Oct 14 | 166 | 17 |
| Falls Village | 550 | May 11 | May 27 | Oct 4 | 146 | 18 |
| Groton | 40 | Apr 8 | Apr 22 | Nov 2 | 207 | 24 |
| Groton NEw London AP | 10 | Apr 16 | Apr 30 | Oct 28 | 194 | 20 |
| Hampton | 490 | Apr 30 | May 11 | Oct 15 | 167 | 12 |
| Hartford Bradley Intl AP | 190 | Apr 21 | May 6 | Oct 16 | 177 | 30 |
| Hartford Brainard Fld | 19 | Apr 17 | May 1 | Oct 26 | 191 | 28 |
| Meriden Markham Muni AP | 103 | Apr 26 | May 9 | Oct 16 | 175 | 19 |
| Mt Carmel | 180 | Apr 18 | May 3 | Oct 26 | 191 | 12 |
| New Haven Tweed AP | 3 | Apr 17 | May 1 | Oct 27 | 193 | 19 |
| Norfolk 2 SW | 1,340 | May 3 | May 17 | Oct 11 | 161 | 30 |
| Norwich Public Utility Plt | 20 | Apr 14 | Apr 30 | Oct 24 | 192 | 26 |
| Staffordville | 736 | May 7 | May 21 | Oct 12 | 159 | 18 |
| Stamford 5 N | 190 | Apr 17 | May 2 | Oct 23 | 188 | 22 |
| Storrs | 665 | Apr 19 | May 3 | Oct 22 | 186 | 26 |
| W Thompson Lake | 360 | May 1 | May 17 | Oct 9 | 161 | 28 |
| Willimantic Windham AP | 247 | Apr 28 | May 11 | Oct 13 | 167 | 24 |
Source: NOAA NCEI U.S. Climate Normals 1991-2020, read 2026-10-17. Stations flagged "estimated" by NOAA are excluded.