New Haven, CT 06473 Frost Dates
When can you plant in New Haven, CT?
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 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
About 9 weeks of growing season left in New Haven before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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
At roughly 193 frost-free days, New Haven places 19,680 of 40,283 ZIP codes in this dataset. Within CT, it ranks 56 of 391.
Learn more
local microclimates covers what one yard in New Haven can differ from the 06473 normal. zone vs. frost date covers why Zone 6b and New Haven's frost date answer different questions.