Baltimore, MD 21210 Frost Dates
When can you plant in Baltimore, MD?
Around 04/02 is the usual last spring frost, about 217 days away. The first fall frost typically arrives around 11/07, about 220 frost-free days later.
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.
What to do before the first frost
About 10 weeks of growing season left in Baltimore before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/02 isn't a guarantee
04/02 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 and you're betting against frost in roughly 9 years out of 10. 04/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Baltimore compares
Baltimore's growing season runs about 220 days, ranking 12,641 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 148 of 583.
Learn more
the frost range covers how to read the range around Baltimore's dates instead of trusting one. local microclimates covers what one yard in Baltimore can differ from the 21210 normal.