Trenton, NJ 08648 Frost Dates
Frost dates for Trenton, NJ, ZIP 08648
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/28, about 192 frost-free days later.
Trenton sits in USDA Zone 7a (0 to 5°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 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 20,128 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 542 of 906.
Learn more
zone vs. frost date explains why Zone 7a and Trenton's frost date answer different questions, and the frost range explains how to read the range around Trenton's dates instead of trusting one.