Norwich, CT 06237 Frost Dates
Norwich, CT: when does the frost end?
Typically, the last spring freeze lands around 04/28, roughly 243 days out. Fall's first freeze usually shows up around 10/13, roughly 167 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
With roughly 7 weeks until Norwich's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Norwich against the rest of the dataset
Norwich's growing season runs about 167 days, ranking 29,869 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 341 of 391.
Learn more
Before leaning on 06237's figures: the frost range explains how to read the range around Norwich's dates instead of trusting one, while local microclimates explains what one yard in Norwich can differ from the 06237 normal.