Baltimore, MD 21208 Frost Dates
Baltimore, MD: when does the frost end?
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 11/07, roughly 220 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Baltimore 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
With roughly 10 weeks until Baltimore's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/13 and only about 1 year in 10 sees frost after that.
Baltimore against the rest of the dataset
At roughly 220 frost-free days, Baltimore places 12,639 of 40,283 ZIP codes in this dataset. Within MD, it ranks 146 of 583.
Learn more
Before leaning on 21208's figures: local microclimates explains what one yard in Baltimore can differ from the 21208 normal, while zone vs. frost date explains why Zone 7b and Baltimore's frost date answer different questions.