Hartford, CT 06127 Frost Dates
Hartford, CT: when does the frost end?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/26, roughly 191 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 8 weeks until Hartford's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/01 and only about 1 year in 10 sees frost after that.
Hartford against the rest of the dataset
At roughly 191 frost-free days, Hartford places 20,648 of 40,283 ZIP codes in this dataset. Within CT, it ranks 160 of 391.
Learn more
Before leaning on 06127's figures: local microclimates explains what one yard in Hartford can differ from the 06127 normal, while zone vs. frost date explains why Zone 6b and Hartford's frost date answer different questions.