Hackettstown, NJ 07880 Frost Dates
Frost dates for Hackettstown, NJ, ZIP 07880
Typically, the last spring freeze lands around 04/25, roughly 240 days out. The first fall frost typically arrives around 10/19, about 175 frost-free days later.
Hackettstown 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
Zone 6b around Hackettstown has about 7 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.
Why 04/25 isn't a guarantee
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. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hackettstown compares
At roughly 175 frost-free days, Hackettstown places 26,811 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 815 of 906.
Learn more
the frost range explains how to read the range around Hackettstown's dates instead of trusting one, and local microclimates explains what one yard in Hackettstown can differ from the 07880 normal.