Norwalk, CT 06854 Frost Dates
Frost dates for Norwalk, CT, ZIP 06854
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 10/23, about 188 frost-free days later.
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.
What to do before the first frost
Zone 7a around Norwalk has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Norwalk's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Norwalk compares
At roughly 188 frost-free days, Norwalk places 21,811 of 40,283 ZIP codes in this dataset. Within CT, it ranks 222 of 391.
Learn more
local microclimates explains what one yard in Norwalk can differ from the 06854 normal, and zone vs. frost date explains why Zone 7a and Norwalk's frost date answer different questions.