Leonardtown, MD 20690 Frost Dates
20690, near Leonardtown, MD: the frost window
Typically, the last spring freeze lands around 03/30, roughly 214 days out. Fall's first freeze usually shows up around 11/14, roughly 229 days after the last spring frost.
Leonardtown sits in USDA Zone 8a (10 to 15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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
About 229 days separate Leonardtown's last and first frost, putting it 10,581 of 40,283 ZIP codes nationally. Within MD, it ranks 94 of 583.
Learn more
Two guides worth reading on 20690: local microclimates, on what one yard in Leonardtown can differ from the 20690 normal, and zone vs. frost date, on why Zone 8a and Leonardtown's frost date answer different questions.