New London, CT 06333 Frost Dates
06333, near New London, CT: the frost window
Around 04/16 is the usual last spring frost, about 231 days away. Fall's first freeze usually shows up around 10/28, roughly 194 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts New London 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
New London'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 New London's last frost
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
New London against the rest of the dataset
At roughly 194 frost-free days, New London places 19,434 of 40,283 ZIP codes in this dataset. Within CT, it ranks 46 of 391.
Learn more
Two guides worth reading on 06333: zone vs. frost date, on why Zone 7a and New London's frost date answer different questions, and the frost range, on how to read the range around New London's dates instead of trusting one.