Danbury, CT 06877 Frost Dates
When can you plant in Danbury, CT?
Typically, the last spring freeze lands around 05/01, roughly 246 days out. The first fall frost typically arrives around 10/14, about 166 frost-free days later.
Danbury 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 7 weeks of growing season left in Danbury before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Danbury compares
At roughly 166 frost-free days, Danbury places 30,271 of 40,283 ZIP codes in this dataset. Within CT, it ranks 353 of 391.
Learn more
zone vs. frost date covers why Zone 6b and Danbury's frost date answer different questions. the frost range covers how to read the range around Danbury's dates instead of trusting one.