Washington Grove, MD 20877 Frost Dates
Washington Grove, MD: when does the frost end?
Typically, the last spring freeze lands around 04/01, roughly 216 days out. Fall's first freeze usually shows up around 11/06, roughly 219 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Washington Grove in Zone 7b (5 to 10°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
With roughly 10 weeks until Washington Grove's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Washington Grove against the rest of the dataset
About 219 days separate Washington Grove's last and first frost, putting it 13,090 of 40,283 ZIP codes nationally. Within MD, it ranks 234 of 583.
Learn more
Before leaning on 20877's figures: the frost range explains how to read the range around Washington Grove's dates instead of trusting one, while local microclimates explains what one yard in Washington Grove can differ from the 20877 normal.