Dover, NJ 07999 Frost Dates
Frost dates for Dover, NJ, ZIP 07999
Around 04/17 is the usual last spring frost, about 232 days away. The first fall frost typically arrives around 10/23, about 189 frost-free days later.
Dover 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 Dover has about 8 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.
Why 04/17 isn't a guarantee
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 Dover compares
At roughly 189 frost-free days, Dover places 21,436 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 605 of 906.
Learn more
the frost range explains how to read the range around Dover's dates instead of trusting one, and local microclimates explains what one yard in Dover can differ from the 07999 normal.