Baltimore, MD 21216 Frost Dates
Frost dates for Baltimore, MD, ZIP 21216
Typically, the last spring freeze lands around 04/02, roughly 217 days out. The first fall frost typically arrives around 11/07, about 220 frost-free days later.
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.
What to do before the first frost
Zone 7b around Baltimore has about 10 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
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
At roughly 220 frost-free days, Baltimore places 12,646 of 40,283 ZIP codes in this dataset. Within MD, it ranks 153 of 583.
Learn more
local microclimates explains what one yard in Baltimore can differ from the 21216 normal, and zone vs. frost date explains why Zone 7b and Baltimore's frost date answer different questions.