Norwich, CT 06389 Frost Dates
06389, near Norwich, CT: the frost window
Around 04/14 is the usual last spring frost, about 229 days away. Fall's first freeze usually shows up around 10/24, roughly 192 days after the last spring frost.
Norwich sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
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.
The actual range around Norwich's last frost
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
About 192 days separate Norwich's last and first frost, putting it 20,165 of 40,283 ZIP codes nationally. Within CT, it ranks 114 of 391.
Learn more
Two guides worth reading on 06389: local microclimates, on what one yard in Norwich can differ from the 06389 normal, and zone vs. frost date, on why Zone 6b and Norwich's frost date answer different questions.