Norwalk, CT 06889 Frost Dates
When can you plant in Norwalk, CT?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/23, about 188 frost-free days later.
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.
What to do before the first frost
About 8 weeks of growing season left in Norwalk before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 21,817 of 40,283 ZIP codes nationally. Within CT, it ranks 228 of 391.
Learn more
the frost range covers how to read the range around Norwalk's dates instead of trusting one. local microclimates covers what one yard in Norwalk can differ from the 06889 normal.