Hartford, CT 06232 Frost Dates
When can you plant in Hartford, CT?
Typically, the last spring freeze lands around 04/19, roughly 234 days out. The first fall frost typically arrives around 10/22, about 186 frost-free days later.
Hartford sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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.
The actual range around Hartford's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hartford compares
Hartford's growing season runs about 186 days, ranking 22,677 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 233 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.