Baltimore, MD 21281 Frost Dates
Frost dates for Baltimore, MD, ZIP 21281
Typically, the last spring freeze lands around 03/24, roughly 208 days out. The first fall frost typically arrives around 11/21, about 244 frost-free days later.
Baltimore sits in USDA Zone 8a (10 to 15°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
Zone 8a around Baltimore has about 12 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Baltimore's last frost
03/24 is the middle of 30 years of NOAA records, not a promise. Plant by 03/08 and you're betting against frost in roughly 9 years out of 10. 04/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Baltimore compares
Baltimore's growing season runs about 244 days, ranking 8,180 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 49 of 583.
Learn more
the frost range explains how to read the range around Baltimore's dates instead of trusting one, and local microclimates explains what one yard in Baltimore can differ from the 21281 normal.