Delmar, MD 21875 Frost Dates
21875, near Delmar, MD: the frost window
Around 04/02 is the usual last spring frost, about 217 days away. Fall's first freeze usually shows up around 11/10, roughly 222 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Delmar 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
Delmar's growing season runs out in roughly 11 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 Delmar's last frost
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/16 and only about 1 year in 10 sees frost after that.
Delmar against the rest of the dataset
Delmar's growing season runs about 222 days, ranking 12,256 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 133 of 583.
Learn more
Two guides worth reading on 21875: the frost range, on how to read the range around Delmar's dates instead of trusting one, and local microclimates, on what one yard in Delmar can differ from the 21875 normal.