Norwich, CT 06380 Frost Dates
When can you plant in Norwich, CT?
Around 04/14 is the usual last spring frost, about 229 days away. The first fall frost typically arrives around 10/24, about 192 frost-free days later.
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.
What to do before the first frost
About 8 weeks of growing season left in Norwich before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Norwich's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Norwich compares
Norwich's growing season runs about 192 days, ranking 20,163 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 112 of 391.
Learn more
local microclimates covers what one yard in Norwich can differ from the 06380 normal. zone vs. frost date covers why Zone 6b and Norwich's frost date answer different questions.