Mendham, NJ 07926 Frost Dates
When can you plant in Mendham, NJ?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. The first fall frost typically arrives around 10/23, about 189 frost-free days later.
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.
What to do before the first frost
About 8 weeks of growing season left in Mendham before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Mendham's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mendham compares
At roughly 189 frost-free days, Mendham places 21,544 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 645 of 906.
Learn more
the frost range covers how to read the range around Mendham's dates instead of trusting one. local microclimates covers what one yard in Mendham can differ from the 07926 normal.