Brookeville, MD 20833 Frost Dates
20833, near Brookeville, MD: the frost window
Around 04/01 is the usual last spring frost, about 216 days away. Fall's first freeze usually shows up around 11/06, roughly 219 days after the last spring frost.
Zone 7b (5 to 10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Brookeville, not a forecast for this year.
Stretching the season past the first frost
Brookeville's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
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 04/15 and only about 1 year in 10 sees frost after that.
Brookeville against the rest of the dataset
Brookeville's growing season runs about 219 days, ranking 13,115 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 238 of 583.
Learn more
Two guides worth reading on 20833: local microclimates, on what one yard in Brookeville can differ from the 20833 normal, and zone vs. frost date, on why Zone 7b and Brookeville's frost date answer different questions.