Connecticut frost dates
Across 23 weather stations in Connecticut, the median last spring frost runs from Apr 5 in Bridgeport Sikorsky Memorial Airport to May 11 in Falls Village, and the first fall frost from Oct 4 to Nov 6.
Connecticut at a glance
- Weather stations
- 23
- Earliest last frost
- Apr 5 Bridgeport Sikorsky Memorial Airport
- Latest last frost
- May 11 Falls Village
- Longest season
- 216 days Bridgeport Sikorsky Memorial Airport
- Typical season
- about 175 frost-free days
- Hardiness zones
- Zones 6a to 7a
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Ansonia | Apr 25 | Oct 17 | 175 | 6b |
| Bakersville | May 8 | Oct 5 | 151 | 6a |
| Barkhamsted | Apr 30 | Oct 17 | 168 | 6a |
| Bridgeport Sikorsky Memorial Airport | Apr 5 | Nov 6 | 216 | 7a |
| Burlington | Apr 25 | Oct 18 | 172 | 6a |
| Danbury | Apr 20 | Oct 20 | 181 | 6b |
| Danbury Municipal Airport | May 1 | Oct 14 | 166 | 6b |
| Falls Village | May 11 | Oct 4 | 146 | 6a |
| Groton | Apr 8 | Nov 2 | 207 | 7a |
| Groton New London Airport | Apr 16 | Oct 28 | 194 | 7a |
| Hampton | Apr 30 | Oct 15 | 167 | 6b |
| Hartford Bradley International Airport | Apr 21 | Oct 16 | 177 | 6b |
| Hartford Brainard Field | Apr 17 | Oct 26 | 191 | 6b |
| Meriden Markham Municipal Airport | Apr 26 | Oct 16 | 175 | 6b |
| Mount Carmel | Apr 18 | Oct 26 | 191 | 6b |
| New Haven Tweed Airport | Apr 17 | Oct 27 | 193 | 7a |
| Norfolk | May 3 | Oct 11 | 161 | 6a |
| Norwich Public Utility Plant | Apr 14 | Oct 24 | 192 | 6b |
| Staffordville | May 7 | Oct 12 | 159 | 6b |
| Stamford | Apr 17 | Oct 23 | 188 | 7a |
| Storrs | Apr 19 | Oct 22 | 186 | 6b |
| West Thompson Lake | May 1 | Oct 9 | 161 | 6b |
| Willimantic Windham Airport | Apr 28 | Oct 13 | 167 | 6b |
Median dates from NOAA 1991–2020 climate normals. How to read them.