Annapolis, MD 21404 Frost Dates
21404, near Annapolis, MD: the frost window
Around 03/27 is the usual last spring frost, about 211 days away. Fall's first freeze usually shows up around 11/13, roughly 234 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Annapolis in Zone 8a (10 to 15°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
Annapolis'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 Annapolis's last frost
03/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/09 and only about 1 year in 10 sees frost after that.
Annapolis against the rest of the dataset
Annapolis's growing season runs about 234 days, ranking 9,705 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 72 of 583.
Learn more
Two guides worth reading on 21404: local microclimates, on what one yard in Annapolis can differ from the 21404 normal, and zone vs. frost date, on why Zone 8a and Annapolis's frost date answer different questions.