Mamaroneck, NY 10543 Frost Dates
Frost dates for Mamaroneck, NY, ZIP 10543
The last spring frost here typically falls around 04/20, about 235 days from today. The first fall frost typically arrives around 10/26, about 189 frost-free days later.
Mamaroneck sits in USDA Zone 7b (5 to 10°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 7b around Mamaroneck 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.
How much risk comes with planting early here
04/20 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. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mamaroneck compares
About 189 days separate Mamaroneck's last and first frost, putting it 21,429 of 40,283 ZIP codes nationally. Within NY, it ranks 385 of 1,951.
Learn more
the frost range explains how to read the range around Mamaroneck's dates instead of trusting one, and local microclimates explains what one yard in Mamaroneck can differ from the 10543 normal.