Annapolis, MD 21402 Frost Dates
Annapolis, MD: when does the frost end?
Typically, the last spring freeze lands around 03/23, roughly 207 days out. Fall's first freeze usually shows up around 11/20, roughly 241 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 Annapolis, not a forecast for this year.
Stretching the season past the first frost
With roughly 12 weeks until Annapolis's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/23 isn't a guarantee
03/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/06 and only about 1 year in 10 sees frost after that.
Annapolis against the rest of the dataset
At roughly 241 frost-free days, Annapolis places 8,513 of 40,283 ZIP codes in this dataset. Within MD, it ranks 56 of 583.
Learn more
Before leaning on 21402's figures: local microclimates explains what one yard in Annapolis can differ from the 21402 normal, while zone vs. frost date explains why Zone 8a and Annapolis's frost date answer different questions.