Norwich, CT 06339 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.
The USDA Plant Hardiness Zone Map puts Norwich in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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.
Why 04/14 isn't a guarantee
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 20,160 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 109 of 391.
Learn more
zone vs. frost date covers why Zone 6b and Norwich's frost date answer different questions. the frost range covers how to read the range around Norwich's dates instead of trusting one.