Baltimore, MD 21224 Frost Dates
21224, near Baltimore, MD: the frost window
The last spring frost here typically falls around 03/24, about 208 days from today. Fall's first freeze usually shows up around 11/21, roughly 244 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 Baltimore, not a forecast for this year.
Stretching the season past the first frost
Baltimore's growing season runs out in roughly 12 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 Baltimore's last frost
03/24 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 04/04 and only about 1 year in 10 sees frost after that.
Baltimore against the rest of the dataset
At roughly 244 frost-free days, Baltimore places 8,161 of 40,283 ZIP codes in this dataset. Within MD, it ranks 30 of 583.
Learn more
Two guides worth reading on 21224: the frost range, on how to read the range around Baltimore's dates instead of trusting one, and local microclimates, on what one yard in Baltimore can differ from the 21224 normal.