Hopatcong, NJ 07843 Frost Dates
07843, near Hopatcong, NJ: the frost window
Around 04/25 is the usual last spring frost, about 240 days away. Fall's first freeze usually shows up around 10/19, roughly 175 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Hopatcong, not a forecast for this year.
Stretching the season past the first frost
Hopatcong's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Hopatcong against the rest of the dataset
Hopatcong's growing season runs about 175 days, ranking 26,783 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 809 of 906.
Learn more
Two guides worth reading on 07843: local microclimates, on what one yard in Hopatcong can differ from the 07843 normal, and zone vs. frost date, on why Zone 6b and Hopatcong's frost date answer different questions.