Norwalk, CT 06850 Frost Dates
Frost dates for Norwalk, CT, ZIP 06850
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.
The USDA Plant Hardiness Zone Map puts Norwalk in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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.
How much risk comes with planting early here
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
About 188 days separate Norwalk's last and first frost, putting it 21,808 of 40,283 ZIP codes nationally. Within CT, it ranks 219 of 391.
Learn more
the frost range explains how to read the range around Norwalk's dates instead of trusting one, and local microclimates explains what one yard in Norwalk can differ from the 06850 normal.