Stonington, CT 02880 Frost Dates
Frost dates for Stonington, CT, ZIP 02880
The last spring frost here typically falls around 04/11, about 226 days from today. The first fall frost typically arrives around 10/31, about 201 frost-free days later.
The USDA Plant Hardiness Zone Map puts Stonington in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Stonington has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
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
About 201 days separate Stonington's last and first frost, putting it 17,589 of 40,283 ZIP codes nationally. Within CT, it ranks 38 of 391.
Learn more
zone vs. frost date explains why Zone 7a and Stonington's frost date answer different questions, and the frost range explains how to read the range around Stonington's dates instead of trusting one.