Litchfield, CT 06787 Frost Dates
06787, near Litchfield, CT: the frost window
Typically, the last spring freeze lands around 04/25, roughly 240 days out. Fall's first freeze usually shows up around 10/18, roughly 172 days after the last spring frost.
Zone 6a (-10 to -5°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 Litchfield, not a forecast for this year.
Stretching the season past the first frost
Litchfield'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.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Litchfield against the rest of the dataset
At roughly 172 frost-free days, Litchfield places 28,390 of 40,283 ZIP codes in this dataset. Within CT, it ranks 330 of 391.
Learn more
Two guides worth reading on 06787: local microclimates, on what one yard in Litchfield can differ from the 06787 normal, and zone vs. frost date, on why Zone 6a and Litchfield's frost date answer different questions.