New Haven, CT 06471 Frost Dates
Frost dates for New Haven, CT, ZIP 06471
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 10/27, about 193 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for New Haven, not a forecast for this year.
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
New Haven's growing season runs about 193 days, ranking 19,679 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 55 of 391.
Learn more
the frost range explains how to read the range around New Haven's dates instead of trusting one, and local microclimates explains what one yard in New Haven can differ from the 06471 normal.