Leonardtown, MD 20684 Frost Dates
Frost dates for Leonardtown, MD, ZIP 20684
Around 03/30 is the usual last spring frost, about 214 days away. The first fall frost typically arrives around 11/14, about 229 frost-free days later.
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.
What to do before the first frost
Zone 8a around Leonardtown has about 11 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 03/30 isn't a guarantee
03/30 is the middle of 30 years of NOAA records, not a promise. Plant by 03/14 and you're betting against frost in roughly 9 years out of 10. 04/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Leonardtown compares
Leonardtown's growing season runs about 229 days, ranking 10,578 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 91 of 583.
Learn more
zone vs. frost date explains why Zone 8a and Leonardtown's frost date answer different questions, and the frost range explains how to read the range around Leonardtown's dates instead of trusting one.