Danbury, CT 06829 Frost Dates
06829, near Danbury, CT: the frost window
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 10/14, roughly 166 days after the last spring frost.
Danbury sits in USDA Zone 7a (0 to 5°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
Danbury's growing season runs out in roughly 7 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 Danbury's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Danbury against the rest of the dataset
About 166 days separate Danbury's last and first frost, putting it 30,270 of 40,283 ZIP codes nationally. Within CT, it ranks 352 of 391.
Learn more
Two guides worth reading on 06829: zone vs. frost date, on why Zone 7a and Danbury's frost date answer different questions, and the frost range, on how to read the range around Danbury's dates instead of trusting one.