New Haven, CT 06538 Frost Dates
Frost dates for New Haven, CT, ZIP 06538
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/27, about 193 frost-free days later.
New Haven 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 New Haven 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.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/02 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How New Haven compares
At roughly 193 frost-free days, New Haven places 19,711 of 40,283 ZIP codes in this dataset. Within CT, it ranks 87 of 391.
Learn more
zone vs. frost date explains why Zone 7a and New Haven's frost date answer different questions, and the frost range explains how to read the range around New Haven's dates instead of trusting one.