Hartford, CT 06045 Frost Dates
When can you plant in Hartford, CT?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/26, about 191 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hartford 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 8 weeks of growing season left in Hartford before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/01 and you're betting against frost in roughly 9 years out of 10. 05/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hartford compares
At roughly 191 frost-free days, Hartford places 20,624 of 40,283 ZIP codes in this dataset. Within CT, it ranks 136 of 391.
Learn more
zone vs. frost date covers why Zone 6b and Hartford's frost date answer different questions. the frost range covers how to read the range around Hartford's dates instead of trusting one.