Glenarden, MD 20721 Frost Dates
Glenarden, MD: when does the frost end?
Typically, the last spring freeze lands around 04/22, roughly 237 days out. Fall's first freeze usually shows up around 10/22, roughly 183 days after the last spring frost.
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 Glenarden, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Glenarden's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Glenarden against the rest of the dataset
At roughly 183 frost-free days, Glenarden places 23,824 of 40,283 ZIP codes in this dataset. Within MD, it ranks 542 of 583.
Learn more
Before leaning on 20721's figures: local microclimates explains what one yard in Glenarden can differ from the 20721 normal, while zone vs. frost date explains why Zone 7b and Glenarden's frost date answer different questions.