Norwalk, CT 06880 Frost Dates
06880, near Norwalk, CT: the frost window
Around 04/17 is the usual last spring frost, about 232 days away. Fall's first freeze usually shows up around 10/23, roughly 188 days after the last spring frost.
Norwalk 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
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.
How much risk comes with planting early here
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
Norwalk's growing season runs about 188 days, ranking 21,815 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 226 of 391.
Learn more
Two guides worth reading on 06880: local microclimates, on what one yard in Norwalk can differ from the 06880 normal, and zone vs. frost date, on why Zone 7a and Norwalk's frost date answer different questions.