Skip to content
Frost Date Finder

NOAA 1991–2020 freeze normals

Frost Dates in Connecticut

Last and first frost at the 24 NOAA stations behind this site's Connecticut pages.

At the middle station of the 24 in Connecticut where a freeze comes every year, the last spring frost (50%) is April 23 and the first fall frost October 19, a freeze-free season of 177 days. The last frost is earliest at Bridgeport (Bridgeport Sikorsky Mem Airport, CT, April 5) and latest at Torrington (Bakersville, CT, May 8), 33 days apart. The season runs from 151 days at Torrington to 221 at Clinton.

17 of these stations were also in NOAA's previous normals, for 1981–2010. Between the two, the median station's freeze-free season grew 7 days longer, with the last spring frost 2 days earlier and the first fall frost 3 days later; the season lengthened at 16 stations and shortened at 0. The two periods share twenty years, so the change reflects mostly 2011–2020 against 1981–1990.

Connecticut places by frost date

Frost dates of the Connecticut places with a page, largest first
PlaceZIPLast frostFirst frostSeasonWinters with 32°F
Stamford06902April 17October 23188 d100%
Bristol06010April 25October 18172 d100%
Danbury06810April 20October 20181 d100%
West Haven06516April 17October 27193 d100%
Bridgeport06606April 5November 6216 d100%
Middletown06457April 26October 16175 d100%
Shelton06484April 25October 17175 d100%
Enfield06082April 21October 16177 d100%
Hartford06106April 17October 26191 d100%
Norwich06360April 14October 24192 d100%
Torrington06790May 8October 5151 d100%
Naugatuck06770April 18October 26191 d100%
Groton06340April 8November 2207 d100%
New London06320April 16October 28194 d100%
Ridgefield06877May 1October 14166 d100%
Willimantic06226April 28October 13167 d100%
Ellington06029May 7October 12159 d100%
Tolland06084April 19October 22186 d100%
Clinton06413April 6November 17221 d100%
Danielson06239April 25October 19176 d100%
Winsted06098April 30October 17168 d100%
Putnam06260May 1October 9161 d100%
Brooklyn06234April 30October 15167 d100%
Goshen06756May 3October 11161 d100%

50% dates from NOAA NCEI U.S. Climate Normals 1991–2020, one row per station; a state page is published when at least 5 stations stand behind its pages. Where a freeze comes in fewer than nine winters in ten, the dates describe the winters that have one.