Mendham, NJ 07945 Frost Dates
07945, near Mendham, NJ: the frost window
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/18, roughly 176 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 Mendham, not a forecast for this year.
Stretching the season past the first frost
Mendham'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.
The actual range around Mendham's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Mendham against the rest of the dataset
About 176 days separate Mendham's last and first frost, putting it 26,438 of 40,283 ZIP codes nationally. Within NJ, it ranks 793 of 906.
Learn more
Two guides worth reading on 07945: local microclimates, on what one yard in Mendham can differ from the 07945 normal, and zone vs. frost date, on why Zone 6b and Mendham's frost date answer different questions.