Baltimore, MD 21217 Frost Dates
Baltimore, MD: when does the frost end?
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.
Baltimore sits in USDA Zone 7b (5 to 10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 12 weeks until Baltimore's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
Baltimore's growing season runs about 244 days, ranking 8,154 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 23 of 583.
Learn more
Before leaning on 21217's figures: zone vs. frost date explains why Zone 7b and Baltimore's frost date answer different questions, while the frost range explains how to read the range around Baltimore's dates instead of trusting one.