Leonardtown, MD 20650 Frost Dates
20650, near Leonardtown, MD: the frost window
The last spring frost here typically falls around 03/22, about 206 days from today. Fall's first freeze usually shows up around 11/26, roughly 248 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 Leonardtown, not a forecast for this year.
Stretching the season past the first frost
Leonardtown's growing season runs out in roughly 13 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Leonardtown's last frost
03/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/05 and only about 1 year in 10 sees frost after that.
Leonardtown against the rest of the dataset
About 248 days separate Leonardtown's last and first frost, putting it 7,704 of 40,283 ZIP codes nationally. Within MD, it ranks 11 of 583.
Learn more
Two guides worth reading on 20650: zone vs. frost date, on why Zone 7b and Leonardtown's frost date answer different questions, and the frost range, on how to read the range around Leonardtown's dates instead of trusting one.