Leonardtown, MD 20635 Frost Dates
Frost dates for Leonardtown, MD, ZIP 20635
Around 03/22 is the usual last spring frost, about 206 days away. The first fall frost typically arrives around 11/26, about 248 frost-free days later.
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.
What to do before the first frost
Zone 7b around Leonardtown has about 13 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 03/22 isn't a guarantee
03/22 is the middle of 30 years of NOAA records, not a promise. Plant by 03/06 and you're betting against frost in roughly 9 years out of 10. 04/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Leonardtown compares
About 248 days separate Leonardtown's last and first frost, putting it 7,702 of 40,283 ZIP codes nationally. Within MD, it ranks 9 of 583.
Learn more
the frost range explains how to read the range around Leonardtown's dates instead of trusting one, and local microclimates explains what one yard in Leonardtown can differ from the 20635 normal.