Waterbury, CT 06704 Frost Dates
06704, near Waterbury, CT: the frost window
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/16, roughly 175 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Waterbury, not a forecast for this year.
Stretching the season past the first frost
Waterbury'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 Waterbury's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Waterbury against the rest of the dataset
At roughly 175 frost-free days, Waterbury places 26,704 of 40,283 ZIP codes in this dataset. Within CT, it ranks 284 of 391.
Learn more
Two guides worth reading on 06704: zone vs. frost date, on why Zone 6b and Waterbury's frost date answer different questions, and the frost range, on how to read the range around Waterbury's dates instead of trusting one.