Trenton, NJ 08609 Frost Dates
Trenton, NJ: when does the frost end?
Around 04/17 is the usual last spring frost, about 232 days away. 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
With roughly 9 weeks until Trenton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/17 isn't a guarantee
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
At roughly 192 frost-free days, Trenton places 20,117 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 531 of 906.
Learn more
Before leaning on 08609's figures: zone vs. frost date explains why Zone 7a and Trenton's frost date answer different questions, while the frost range explains how to read the range around Trenton's dates instead of trusting one.