Hackettstown, NJ 07840 Frost Dates
Frost dates for Hackettstown, NJ, ZIP 07840
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/19, about 175 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hackettstown, not a forecast for this year.
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.
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. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hackettstown compares
About 175 days separate Hackettstown's last and first frost, putting it 26,809 of 40,283 ZIP codes nationally. Within NJ, it ranks 813 of 906.
Learn more
local microclimates explains what one yard in Hackettstown can differ from the 07840 normal, and zone vs. frost date explains why Zone 6b and Hackettstown's frost date answer different questions.