New Haven, CT 06724 Frost Dates
New Haven, CT: when does the frost end?
Around 04/17 is the usual last spring frost, about 232 days away. 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 6b (-5 to 0°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.
How much risk comes with planting early here
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
New Haven's growing season runs about 193 days, ranking 19,719 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 95 of 391.
Learn more
Before leaning on 06724's figures: local microclimates explains what one yard in New Haven can differ from the 06724 normal, while zone vs. frost date explains why Zone 6b and New Haven's frost date answer different questions.