Millstone, NJ 08823 Frost Dates
Frost dates for Millstone, NJ, ZIP 08823
Typically, the last spring freeze lands around 04/25, roughly 240 days out. The first fall frost typically arrives around 10/16, about 173 frost-free days later.
Millstone 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.
What to do before the first frost
Zone 7a around Millstone has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Millstone compares
Millstone's growing season runs about 173 days, ranking 28,054 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 860 of 906.
Learn more
local microclimates explains what one yard in Millstone can differ from the 08823 normal, and zone vs. frost date explains why Zone 7a and Millstone's frost date answer different questions.