Norwich, CT 06370 Frost Dates
06370, near Norwich, CT: the frost window
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/24, roughly 192 days after the last spring frost.
Zone 6b (-5 to 0°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 Norwich, not a forecast for this year.
Stretching the season past the first frost
Norwich's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 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.
Norwich against the rest of the dataset
Norwich's growing season runs about 192 days, ranking 20,162 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 111 of 391.
Learn more
Two guides worth reading on 06370: local microclimates, on what one yard in Norwich can differ from the 06370 normal, and zone vs. frost date, on why Zone 6b and Norwich's frost date answer different questions.