New Windsor, MD 21776 Frost Dates
21776, near New Windsor, MD: the frost window
Typically, the last spring freeze lands around 04/22, roughly 237 days out. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts New Windsor in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
New Windsor's growing season runs out in roughly 8 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
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
New Windsor against the rest of the dataset
At roughly 179 frost-free days, New Windsor places 25,357 of 40,283 ZIP codes in this dataset. Within MD, it ranks 550 of 583.
Learn more
Two guides worth reading on 21776: local microclimates, on what one yard in New Windsor can differ from the 21776 normal, and zone vs. frost date, on why Zone 7a and New Windsor's frost date answer different questions.