Trenton, NJ 08625 Frost Dates
08625, near Trenton, NJ: the frost window
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/28, roughly 192 days after the last spring frost.
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.
Stretching the season past the first frost
Trenton's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Trenton against the rest of the dataset
Trenton's growing season runs about 192 days, ranking 20,122 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 536 of 906.
Learn more
Two guides worth reading on 08625: local microclimates, on what one yard in Trenton can differ from the 08625 normal, and zone vs. frost date, on why Zone 7a and Trenton's frost date answer different questions.