Perth Amboy, NJ 10309 Frost Dates
Perth Amboy, NJ: when does the frost end?
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 11/10, roughly 222 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Perth Amboy in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 11 weeks until Perth Amboy's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/02 isn't a guarantee
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Perth Amboy against the rest of the dataset
Perth Amboy's growing season runs about 222 days, ranking 12,193 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 248 of 906.
Learn more
Before leaning on 10309's figures: local microclimates explains what one yard in Perth Amboy can differ from the 10309 normal, while zone vs. frost date explains why Zone 7b and Perth Amboy's frost date answer different questions.