Mount Vernon, NY 10550 Frost Dates
Frost dates for Mount Vernon, NY, ZIP 10550
Typically, the last spring freeze lands around 04/01, roughly 216 days out. The first fall frost typically arrives around 11/16, about 230 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mount Vernon in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Mount Vernon has about 11 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 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mount Vernon compares
At roughly 230 frost-free days, Mount Vernon places 10,302 of 40,283 ZIP codes in this dataset. Within NY, it ranks 55 of 1,951.
Learn more
local microclimates explains what one yard in Mount Vernon can differ from the 10550 normal, and zone vs. frost date explains why Zone 7b and Mount Vernon's frost date answer different questions.