Groton Long Point, CT 06388 Frost Dates
06388, near Groton Long Point, CT: the frost window
Around 04/08 is the usual last spring frost, about 223 days away. Fall's first freeze usually shows up around 11/02, roughly 207 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 Groton Long Point, not a forecast for this year.
Stretching the season past the first frost
Groton Long Point's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Groton Long Point's last frost
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/22 and only about 1 year in 10 sees frost after that.
Groton Long Point against the rest of the dataset
Groton Long Point's growing season runs about 207 days, ranking 15,866 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 31 of 391.
Learn more
Two guides worth reading on 06388: local microclimates, on what one yard in Groton Long Point can differ from the 06388 normal, and zone vs. frost date, on why Zone 7a and Groton Long Point's frost date answer different questions.