Stonington, CT 02875 Frost Dates
Frost dates for Stonington, CT, ZIP 02875
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/12, about 163 frost-free days later.
The USDA Plant Hardiness Zone Map puts Stonington in Zone 6b (-5 to 0°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 6b around Stonington has about 6 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.
The actual range around Stonington's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Stonington compares
At roughly 163 frost-free days, Stonington places 31,459 of 40,283 ZIP codes in this dataset. Within CT, it ranks 357 of 391.
Learn more
zone vs. frost date explains why Zone 6b 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.