Hartford, CT 06102 Frost Dates
Frost dates for Hartford, CT, ZIP 06102
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
Zone 6b around Hartford has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
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
Hartford's growing season runs about 191 days, ranking 20,630 of 40,283 US ZIP codes measured here, longest to shortest. Within CT, it ranks 142 of 391.
Learn more
the frost range explains how to read the range around Hartford's dates instead of trusting one, and local microclimates explains what one yard in Hartford can differ from the 06102 normal.