Hartford, CT 06070 Frost Dates
When can you plant in Hartford, CT?
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/18, about 172 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 7 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.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hartford compares
About 172 days separate Hartford's last and first frost, putting it 28,122 of 40,283 ZIP codes nationally. Within CT, it ranks 315 of 391.
Learn more
the frost range covers how to read the range around Hartford's dates instead of trusting one. local microclimates covers what one yard in Hartford can differ from the 06070 normal.