Connecticut Frost Dates
Connecticut has 23 NOAA weather stations with freeze records in the 1991–2020 climate normals. The typical last spring frost ranges from April 5 at Bridgeport Sikorsky Mem Ap to May 11 at Falls Village; at half the stations it has come by April 25. The first fall frost typically arrives between October 4 at Falls Village and November 6 at Bridgeport Sikorsky Mem Ap, with a median of October 17.
The growing season between the typical frosts runs from 146 days at Falls Village to 216 days at Bridgeport Sikorsky Mem Ap; 175 days at the median station.
Every station in Connecticut
Typical dates have a 50% chance of a frost after them in spring, and before them in fall; safer dates, 10%. A garden can differ from its nearest station, especially in a valley or on a hillside: see why your garden may differ.
| Station | Elevation | Last frost | Safer | First frost | Safer | Season (days) |
|---|---|---|---|---|---|---|
| Ansonia 1 Ne | 136 ft | Apr 25 | May 10 | Oct 17 | Oct 4 | 175 |
| Bakersville | 686 ft | May 8 | May 22 | Oct 5 | Sep 25 | 151 |
| Barkhamsted | 710 ft | Apr 30 | May 15 | Oct 17 | Oct 4 | 168 |
| Bridgeport Sikorsky Mem Ap | 5 ft | Apr 5 | Apr 17 | Nov 6 | Oct 25 | 216 |
| Burlington | 505 ft | Apr 25 | May 10 | Oct 18 | Oct 4 | 172 |
| Danbury Muni Ap | 457 ft | May 1 | May 16 | Oct 14 | Oct 1 | 166 |
| Danbury | 405 ft | Apr 20 | May 6 | Oct 20 | Oct 5 | 181 |
| Falls Village | 550 ft | May 11 | May 27 | Oct 4 | Sep 21 | 146 |
| Groton New London Ap | 10 ft | Apr 16 | Apr 30 | Oct 28 | Oct 13 | 194 |
| Groton | 40 ft | Apr 8 | Apr 22 | Nov 2 | Oct 18 | 207 |
| Hampton | 490 ft | Apr 30 | May 11 | Oct 15 | Oct 1 | 167 |
| Hartford Bradley Intl Ap | 190 ft | Apr 21 | May 6 | Oct 16 | Oct 3 | 177 |
| Hartford Brainard Fld | 19 ft | Apr 17 | May 1 | Oct 26 | Oct 12 | 191 |
| Meriden Markham Muni Ap | 103 ft | Apr 26 | May 9 | Oct 16 | Oct 4 | 175 |
| Mt Carmel | 180 ft | Apr 18 | May 3 | Oct 26 | Oct 11 | 191 |
| New Haven Tweed Ap | 3 ft | Apr 17 | May 1 | Oct 27 | Oct 11 | 193 |
| Norfolk 2 Sw | 1,340 ft | May 3 | May 17 | Oct 11 | Oct 1 | 161 |
| Norwich Public Utility Plt | 20 ft | Apr 14 | Apr 30 | Oct 24 | Oct 9 | 192 |
| Staffordville | 736 ft | May 7 | May 21 | Oct 12 | Oct 1 | 159 |
| Stamford 5 N | 190 ft | Apr 17 | May 2 | Oct 23 | Oct 8 | 188 |
| Storrs | 665 ft | Apr 19 | May 3 | Oct 22 | Oct 6 | 186 |
| W Thompson Lake | 360 ft | May 1 | May 17 | Oct 9 | Sep 30 | 161 |
| Willimantic Windham Ap | 247 ft | Apr 28 | May 11 | Oct 13 | Oct 2 | 167 |
Plan your garden with these dates
Enter your ZIP code in the planner: it picks the nearest of these stations and dates every crop in your beds from its frosts. Free, in your browser.
Questions
When is the last frost in Connecticut?
It depends on where you are. The typical last spring frost at Connecticut's NOAA stations ranges from April 5 to May 11, and half of them have had it by April 25. Enter your ZIP code above for the station nearest you.
When is the first frost in Connecticut?
Typically between October 4 and November 6, depending on the station; the median is October 17. Plan fall crops back from your own station's date.
What do "typical" and "safer" mean?
With the typical (50%) last-frost date, half of years still have a frost after it. With the safer (10%) date, only one year in ten does. In fall it's the other way around: the safer date is the earlier one.
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