Leonardtown, MD 20685 Frost Dates
Leonardtown, MD: when does the frost end?
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 8a (10 to 15°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
With roughly 13 weeks until Leonardtown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/22 isn't a guarantee
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
Leonardtown's growing season runs about 248 days, ranking 7,706 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 13 of 583.
Learn more
Before leaning on 20685's figures: the frost range explains how to read the range around Leonardtown's dates instead of trusting one, while local microclimates explains what one yard in Leonardtown can differ from the 20685 normal.