Newtown, CT 06879 Frost Dates
06879, near Newtown, CT: the frost window
The last spring frost here typically falls around 04/20, about 235 days from today. Fall's first freeze usually shows up around 10/20, roughly 181 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 Newtown, not a forecast for this year.
Stretching the season past the first frost
Newtown's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Newtown against the rest of the dataset
At roughly 181 frost-free days, Newtown places 24,589 of 40,283 ZIP codes in this dataset. Within CT, it ranks 264 of 391.
Learn more
Two guides worth reading on 06879: the frost range, on how to read the range around Newtown's dates instead of trusting one, and local microclimates, on what one yard in Newtown can differ from the 06879 normal.