New Haven, CT 06513 Frost Dates
New Haven, CT: when does the frost end?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/27, roughly 193 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 9 weeks until New Haven's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/01 and only about 1 year in 10 sees frost after that.
New Haven against the rest of the dataset
About 193 days separate New Haven's last and first frost, putting it 19,696 of 40,283 ZIP codes nationally. Within CT, it ranks 72 of 391.
Learn more
Before leaning on 06513's figures: zone vs. frost date explains why Zone 7a and New Haven's frost date answer different questions, while the frost range explains how to read the range around New Haven's dates instead of trusting one.