Connecticut Frost Dates
Across Connecticut's 30 cities and towns, the average last spring frost runs from April 5 in Bridgeport to May 8 in Torrington. Average last frost elsewhere: New Haven Apr 17 and Hartford Apr 17.
Frost dates for every city and town in Connecticut
Dates are for 32°F at the NOAA station nearest the ZIP code at each Connecticut town's center. "Safer date" is when only 1 year in 10 still gets a frost, a good target for tomatoes and peppers.
| City | Average last frost | Safer date | Average first frost | Frost-free days |
|---|---|---|---|---|
| Ansonia | Apr 25 | May 10 | Oct 17 | 175 |
| Bantam | May 8 | May 22 | Oct 5 | 150 |
| Bridgeport | Apr 5 | Apr 17 | Nov 6 | 215 |
| Bristol | Apr 25 | May 10 | Oct 18 | 176 |
| Danbury | Apr 20 | May 6 | Oct 20 | 183 |
| Danielson | Apr 25 | May 9 | Oct 19 | 177 |
| Derby | Apr 25 | May 10 | Oct 17 | 175 |
| Fenwick | Apr 6 | May 2 | Nov 17 | 225 |
| Groton | Apr 8 | Apr 22 | Nov 2 | 208 |
| Groton Long Point | Apr 8 | Apr 22 | Nov 2 | 208 |
| Hartford | Apr 17 | May 1 | Oct 26 | 192 |
| Jewett City | Apr 14 | Apr 30 | Oct 24 | 193 |
| Litchfield | May 8 | May 22 | Oct 5 | 150 |
| Meriden | Apr 26 | May 9 | Oct 16 | 173 |
| Middletown | Apr 26 | May 9 | Oct 16 | 173 |
| Milford | Apr 5 | Apr 17 | Nov 6 | 215 |
| Naugatuck | Apr 18 | May 3 | Oct 26 | 191 |
| New Britain | Apr 17 | May 1 | Oct 26 | 192 |
| New Haven | Apr 17 | May 1 | Oct 27 | 193 |
| New London | Apr 16 | Apr 30 | Oct 28 | 195 |
| Newtown | Apr 20 | May 6 | Oct 20 | 183 |
| Norwalk | Apr 17 | May 2 | Oct 23 | 189 |
| Norwich | Apr 14 | Apr 30 | Oct 24 | 193 |
| Shelton | Apr 25 | May 10 | Oct 17 | 175 |
| Stamford | Apr 17 | May 2 | Oct 23 | 189 |
| Stonington | Apr 11 | Apr 26 | Oct 31 | 203 |
| Torrington | May 8 | May 22 | Oct 5 | 150 |
| Waterbury | Apr 26 | May 9 | Oct 16 | 173 |
| West Haven | Apr 17 | May 1 | Oct 27 | 193 |
| Woodmont | Apr 5 | Apr 17 | Nov 6 | 215 |
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. City centers from the US Census Bureau. Click a city for its nearest station and, where it has frost dates, hard-freeze dates and a vegetable planting calendar. See how we calculate.
Frequently asked questions
When is the last frost in Bridgeport, CT?
The average last spring frost in Bridgeport is April 5, and only 1 year in 10 has a frost after April 17. The average first fall frost is November 6. These come from NOAA's 1991–2020 records at the Bridgeport Sikorsky Mem AP station.
When should I plant tomatoes in Connecticut?
UNH Extension times tomato transplants for 1 to 2 weeks after the average last frost. In Bridgeport that's about Apr 12 to Apr 19. Look up your ZIP code for your own dates and a full vegetable planting calendar.
More for Connecticut: Connecticut climate zones (insulation) · Connecticut planting zones · Frost line depth by state