Baltimore, MD 21093 Frost Dates
21093, near Baltimore, MD: the frost window
Around 04/02 is the usual last spring frost, about 217 days away. 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
Baltimore's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/02 isn't a guarantee
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 12,633 of 40,283 ZIP codes in this dataset. Within MD, it ranks 140 of 583.
Learn more
Two guides worth reading on 21093: 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 21093 normal.