Mount Vernon, NY 10470 Frost Dates
Mount Vernon, NY: when does the frost end?
Around 04/01 is the usual last spring frost, about 216 days away. Fall's first freeze usually shows up around 11/16, roughly 230 days after the last spring frost.
Mount Vernon 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.
Stretching the season past the first frost
With roughly 11 weeks until Mount Vernon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/12 and only about 1 year in 10 sees frost after that.
Mount Vernon against the rest of the dataset
Mount Vernon's growing season runs about 230 days, ranking 10,301 of 40,283 US ZIP codes measured here, longest to shortest. Within NY, it ranks 54 of 1,951.
Learn more
Before leaning on 10470's figures: local microclimates explains what one yard in Mount Vernon can differ from the 10470 normal, while zone vs. frost date explains why Zone 7b and Mount Vernon's frost date answer different questions.