New Haven, CT 06512 Frost Dates
Frost dates for New Haven, CT, ZIP 06512
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.
The USDA Plant Hardiness Zone Map puts New Haven 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 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.
The actual range around New Haven's last frost
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
About 193 days separate New Haven's last and first frost, putting it 19,695 of 40,283 ZIP codes nationally. Within CT, it ranks 71 of 391.
Learn more
local microclimates explains what one yard in New Haven can differ from the 06512 normal, and zone vs. frost date explains why Zone 7a and New Haven's frost date answer different questions.