Leonardtown, MD 20687 Frost Dates
20687, near Leonardtown, MD: the frost window
Around 03/30 is the usual last spring frost, about 214 days away. Fall's first freeze usually shows up around 11/14, roughly 229 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Leonardtown in Zone 8a (10 to 15°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
Leonardtown'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.
The actual range around Leonardtown's last frost
03/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/11 and only about 1 year in 10 sees frost after that.
Leonardtown against the rest of the dataset
At roughly 229 frost-free days, Leonardtown places 10,580 of 40,283 ZIP codes in this dataset. Within MD, it ranks 93 of 583.
Learn more
Two guides worth reading on 20687: local microclimates, on what one yard in Leonardtown can differ from the 20687 normal, and zone vs. frost date, on why Zone 8a and Leonardtown's frost date answer different questions.