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Frost Dates and Planting Windows in Connecticut

The 32°F frost dates at the 23 weather stations in Connecticut with NOAA's 1991–2020 Climate Normals, and the planting windows they give. These are long-term statistics, not a forecast. For the dates at the station nearest you, enter your ZIP code.

The planner uses the weather station nearest your ZIP code.

Frost dates across Connecticut

Each risk level uses a date with a set chance of frost. In spring, it's the chance of a 32°F frost on or after the last-frost date. In fall, it's the chance of the first 32°F frost on or before the first-frost date. At the Typical level (30%), the last frost ranges from April 9 to May 18 across the state, and the first frost from September 30 to November 1.

32°F frost dates: earliest and latest among 23 stations, by risk level
Risk levelEarliest last frostLatest last frostEarliest first frostLatest first frost
Conservative (10%)April 17BRIDGEPORT SIKORSKY MEM AP, CT USMay 27FALLS VILLAGE, CT USSeptember 21FALLS VILLAGE, CT USOctober 25BRIDGEPORT SIKORSKY MEM AP, CT US
Typical (30%)April 9BRIDGEPORT SIKORSKY MEM AP, CT USMay 18FALLS VILLAGE, CT USSeptember 30FALLS VILLAGE, CT USNovember 1BRIDGEPORT SIKORSKY MEM AP, CT US
Aggressive (50%)April 5BRIDGEPORT SIKORSKY MEM AP, CT USMay 11FALLS VILLAGE, CT USOctober 4FALLS VILLAGE, CT USNovember 6BRIDGEPORT SIKORSKY MEM AP, CT US

Growing season length

The growing season is the stretch between the last spring frost and the first fall frost at 32°F. NOAA gives it as a length with a chance of being at least that long. Each risk level uses the length with that chance of a shorter season, so Conservative shows the shortest lengths.

Growing season at 32°F: shortest and longest among 23 stations
Risk levelShortestLongest
Conservative (90% chance of at least this long)126 daysFALLS VILLAGE, CT US198 daysBRIDGEPORT SIKORSKY MEM AP, CT US
Typical (70% chance of at least this long)138 daysFALLS VILLAGE, CT US209 daysBRIDGEPORT SIKORSKY MEM AP, CT US
Aggressive (50% chance of at least this long)146 daysFALLS VILLAGE, CT US216 daysBRIDGEPORT SIKORSKY MEM AP, CT US
Number of stations by growing season length, Typical (70% chance of at least this long)
Growing seasonStations
120–139 days1
140–159 days6
160–179 days8
180–199 days6
200–219 days2

Planting windows across Connecticut

For each crop, the earliest start and the latest end of its Typical windows among the stations. A window at any one station is shorter and falls inside this span. Transplant dates are for seedlings.

Typical planting windows (30% frost dates): earliest start and latest end among stations
Crop and taskEarliest startLatest endStations
Basil: Transplant outdoorsApril 23June 123 of 23
Bean: Sow outdoorsApril 9May 1823 of 23
Beet: Sow outdoorsMarch 12May 1823 of 23
Beet: Sow for fallJuly 8September 1223 of 23
Broccoli: Transplant outdoorsMarch 12May 423 of 23
Broccoli: Transplant for fallJune 28September 1223 of 23
Brussels sprouts: Transplant outdoorsMarch 12May 423 of 23
Brussels sprouts: Transplant for fallJune 8September 2223 of 23
Cabbage: Transplant outdoorsMarch 12May 423 of 23
Cabbage: Transplant for fallJune 23September 1223 of 23
Cantaloupe: Transplant outdoorsApril 23June 123 of 23
Cantaloupe: Sow outdoorsApril 23June 123 of 23
Carrot: Sow outdoorsMarch 12May 1823 of 23
Carrot: Sow for fallJune 28September 223 of 23
Cucumber: Transplant outdoorsApril 16May 2523 of 23
Cucumber: Sow outdoorsApril 9May 1823 of 23
Eggplant: Transplant outdoorsApril 23June 123 of 23
Garlic: Plant for fallSeptember 30November 1523 of 23
Lettuce: Transplant outdoorsMarch 12May 423 of 23
Lettuce: Sow outdoorsMarch 12May 423 of 23
Lettuce: Sow for fallJune 28September 2223 of 23
Onion: Transplant or plant setsMarch 12May 423 of 23
Peas: Sow outdoorsMarch 12May 423 of 23
Peas: Sow for fallJuly 6September 1223 of 23
Pepper: Transplant outdoorsApril 23June 123 of 23
Potato: Plant seed potatoesMarch 12May 1823 of 23
Pumpkin: Sow outdoorsApril 23June 123 of 23
Radish: Sow outdoorsMarch 12May 423 of 23
Radish: Sow for fallAugust 12October 1223 of 23
Spinach: Transplant outdoorsMarch 12May 423 of 23
Spinach: Sow outdoorsMarch 12May 423 of 23
Spinach: Sow for fallJuly 18September 2523 of 23
Summer squash: Transplant outdoorsApril 16May 2523 of 23
Summer squash: Sow outdoorsApril 9May 1823 of 23
Sweet corn: Sow outdoorsApril 9May 1823 of 23
Sweet potato: Plant slipsApril 16June 123 of 23
Tomato: Transplant outdoorsApril 23June 123 of 23
Turnip: Sow outdoorsMarch 12May 423 of 23
Turnip: Sow for fallJuly 18September 2223 of 23
Watermelon: Transplant outdoorsApril 23June 123 of 23
Watermelon: Sow outdoorsApril 23June 123 of 23

Weather stations in Connecticut

Every station in Connecticut with NOAA frost-date normals, with its Typical 32°F frost dates and growing season.

Data sources

NOAA U.S. Climate Normals, frost dates, 1991–2020 normals, version 1.0.1
Files: us-climate-normals_1991-2020_v1.0.1_annualseasonal_multivariate_by-station_c20230404.tar.gz, inventory_30yr.txt from NOAA NCEI. Retrieved October 10, 2026.