Trenton, NJ 08666 Frost Dates
Frost dates for Trenton, NJ, ZIP 08666
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 10/28, about 192 frost-free days later.
The USDA Plant Hardiness Zone Map puts Trenton in Zone 7a (0 to 5°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 7a around Trenton has about 9 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 04/02 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Trenton compares
Trenton's growing season runs about 192 days, ranking 20,130 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 544 of 906.
Learn more
local microclimates explains what one yard in Trenton can differ from the 08666 normal, and zone vs. frost date explains why Zone 7a and Trenton's frost date answer different questions.