New Haven, CT 06703 Frost Dates
Frost dates for New Haven, CT, ZIP 06703
The last spring frost here typically falls around 04/17, about 232 days from today. The first fall frost typically arrives around 10/27, about 193 frost-free days later.
New Haven sits in USDA Zone 6b (-5 to 0°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 6b 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.
How much risk comes with planting early here
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 19,714 of 40,283 ZIP codes in this dataset. Within CT, it ranks 90 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 06703 normal.