Frost dates
Frost dates in Connecticut
Typical last spring frost and first fall frost for 23 weather stations across Connecticut, from NOAA’s 1991–2020 climate normals.
Last spring frost
Apr 14 – May 7
Typical across Connecticut (middle: Apr 25)
First fall frost
Oct 9 – Oct 28
Typical across Connecticut (middle: Oct 17)
Your own yard can differ by weeks from the nearest town. Get frost dates for your exact spot →
By town
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Ansonia 1 NE | Apr 25 | Oct 17 | 175 |
| Bakersville | May 8 | Oct 5 | 150 |
| Barkhamsted | Apr 30 | Oct 17 | 170 |
| Bridgeport Sikorsky Mem Airport | Apr 5 | Nov 6 | 215 |
| Burlington | Apr 25 | Oct 18 | 176 |
| Danbury | Apr 20 | Oct 20 | 183 |
| Danbury Municipal Airport | May 1 | Oct 14 | 166 |
| Falls Village | May 11 | Oct 4 | 146 |
| Groton | Apr 8 | Nov 2 | 208 |
| Groton New London Airport | Apr 16 | Oct 28 | 195 |
| Hampton | Apr 30 | Oct 15 | 168 |
| Hartford Bradley International Airport | Apr 21 | Oct 16 | 178 |
| Hartford Brainard Field | Apr 17 | Oct 26 | 192 |
| Meriden Markham Municipal Airport | Apr 26 | Oct 16 | 173 |
| Mount Carmel | Apr 18 | Oct 26 | 191 |
| New Haven Tweed Airport | Apr 17 | Oct 27 | 193 |
| Norfolk 2 SW | May 3 | Oct 11 | 161 |
| Norwich Public Utility Plt | Apr 14 | Oct 24 | 193 |
| Staffordville | May 7 | Oct 12 | 158 |
| Stamford 5 N | Apr 17 | Oct 23 | 189 |
| Storrs | Apr 19 | Oct 22 | 186 |
| W Thompson Lake | May 1 | Oct 9 | 161 |
| Willimantic Windham Airport | Apr 28 | Oct 13 | 168 |
Each date is the median: in half of years the frost comes earlier, in half later. Frost here means a low of 32°F or colder at the station. Low spots and valleys often frost a week or two earlier than these dates; hillsides and city centers later.
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. The Field almanac also shows how often frost comes early or late, and a reanalysis reading for your exact location.