Hartford, CT 06138 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.
How much risk comes with planting early here
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
About 191 days separate Hartford's last and first frost, putting it 20,656 of 40,283 ZIP codes nationally. Within CT, it ranks 168 of 391.
Learn more
Before leaning on 06138's figures: the frost range explains how to read the range around Hartford's dates instead of trusting one, while local microclimates explains what one yard in Hartford can differ from the 06138 normal.