Norwalk, CT 06851 Frost Dates
Norwalk, CT: when does the frost end?
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.
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.
Stretching the season past the first frost
With roughly 8 weeks until Norwalk's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Norwalk's last frost
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 21,809 of 40,283 ZIP codes nationally. Within CT, it ranks 220 of 391.
Learn more
Before leaning on 06851's figures: zone vs. frost date explains why Zone 7a and Norwalk's frost date answer different questions, while the frost range explains how to read the range around Norwalk's dates instead of trusting one.