Waterbury, CT 06411 Frost Dates
When can you plant in Waterbury, CT?
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/16, about 175 frost-free days later.
The USDA Plant Hardiness Zone Map puts Waterbury in Zone 6b (-5 to 0°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
About 7 weeks of growing season left in Waterbury before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Waterbury's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Waterbury compares
At roughly 175 frost-free days, Waterbury places 26,702 of 40,283 ZIP codes in this dataset. Within CT, it ranks 282 of 391.
Learn more
zone vs. frost date covers why Zone 6b and Waterbury's frost date answer different questions. the frost range covers how to read the range around Waterbury's dates instead of trusting one.