Norwalk, CT 06853 Frost Dates
06853, near Norwalk, CT: the frost window
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/23, roughly 188 days after the last spring frost.
Zone 7a (0 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 Norwalk, not a forecast for this year.
Stretching the season past the first frost
Norwalk'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.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
Norwalk against the rest of the dataset
About 188 days separate Norwalk's last and first frost, putting it 21,810 of 40,283 ZIP codes nationally. Within CT, it ranks 221 of 391.
Learn more
Two guides worth reading on 06853: local microclimates, on what one yard in Norwalk can differ from the 06853 normal, and zone vs. frost date, on why Zone 7a and Norwalk's frost date answer different questions.