New Haven, CT 06701 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.
Zone 6b (-5 to 0°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
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
About 193 days separate New Haven's last and first frost, putting it 19,713 of 40,283 ZIP codes nationally. Within CT, it ranks 89 of 391.
Learn more
zone vs. frost date covers why Zone 6b and New Haven's frost date answer different questions. the frost range covers how to read the range around New Haven's dates instead of trusting one.