New Haven, CT 06405 Frost Dates
New Haven, CT: when does the frost end?
The last spring frost here typically falls around 04/17, about 232 days from today. Fall's first freeze usually shows up around 10/27, roughly 193 days after the last spring frost.
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.
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 19,676 of 40,283 ZIP codes nationally. Within CT, it ranks 52 of 391.
Learn more
Before leaning on 06405's figures: the frost range explains how to read the range around New Haven's dates instead of trusting one, while local microclimates explains what one yard in New Haven can differ from the 06405 normal.