Princess Anne, MD 21821 Frost Dates
21821, near Princess Anne, MD: the frost window
The last spring frost here typically falls around 04/03, about 218 days from today. Fall's first freeze usually shows up around 11/07, roughly 217 days after the last spring frost.
Zone 8a (10 to 15°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 Princess Anne, not a forecast for this year.
Stretching the season past the first frost
Princess Anne'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.
How much risk comes with planting early here
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
Princess Anne against the rest of the dataset
Princess Anne's growing season runs about 217 days, ranking 13,477 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 294 of 583.
Learn more
Two guides worth reading on 21821: zone vs. frost date, on why Zone 8a and Princess Anne's frost date answer different questions, and the frost range, on how to read the range around Princess Anne's dates instead of trusting one.