Old Westbury, NY 11568 Frost Dates
11568, near Old Westbury, NY: the frost window
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 11/12, roughly 224 days after the last spring frost.
Old Westbury 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
Old Westbury's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/16 and only about 1 year in 10 sees frost after that.
Old Westbury against the rest of the dataset
About 224 days separate Old Westbury's last and first frost, putting it 11,855 of 40,283 ZIP codes nationally. Within NY, it ranks 169 of 1,951.
Learn more
Two guides worth reading on 11568: local microclimates, on what one yard in Old Westbury can differ from the 11568 normal, and zone vs. frost date, on why Zone 7b and Old Westbury's frost date answer different questions.