Mardela Springs, MD 21837 Frost Dates
21837, near Mardela Springs, MD: the frost window
Around 04/08 is the usual last spring frost, about 223 days away. Fall's first freeze usually shows up around 11/04, roughly 209 days after the last spring frost.
Mardela Springs sits in USDA Zone 7b (5 to 10°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
Mardela Springs's growing season runs out in roughly 10 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 Mardela Springs's last frost
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
Mardela Springs against the rest of the dataset
About 209 days separate Mardela Springs's last and first frost, putting it 15,405 of 40,283 ZIP codes nationally. Within MD, it ranks 354 of 583.
Learn more
Two guides worth reading on 21837: zone vs. frost date, on why Zone 7b and Mardela Springs's frost date answer different questions, and the frost range, on how to read the range around Mardela Springs's dates instead of trusting one.