Stonington, CT 06378 Frost Dates
When can you plant in Stonington, CT?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. The first fall frost typically arrives around 10/31, about 201 frost-free days later.
Stonington sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 9 weeks of growing season left in Stonington before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 04/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Stonington compares
Stonington's growing season runs about 201 days, ranking 17,593 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 42 of 391.
Learn more
zone vs. frost date covers why Zone 7a and Stonington's frost date answer different questions. the frost range covers how to read the range around Stonington's dates instead of trusting one.