Groton Long Point, CT 06390 Frost Dates
Frost dates for Groton Long Point, CT, ZIP 06390
Typically, the last spring freeze lands around 04/16, roughly 231 days out. The first fall frost typically arrives around 10/28, about 194 frost-free days later.
Groton Long Point 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
Zone 7a around Groton Long Point 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
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Groton Long Point compares
About 194 days separate Groton Long Point's last and first frost, putting it 19,577 of 40,283 ZIP codes nationally. Within CT, it ranks 49 of 391.
Learn more
local microclimates explains what one yard in Groton Long Point can differ from the 06390 normal, and zone vs. frost date explains why Zone 7a and Groton Long Point's frost date answer different questions.