Baltimore, MD 21212 Frost Dates
Frost dates for Baltimore, MD, ZIP 21212
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
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.
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
About 220 days separate Baltimore's last and first frost, putting it 12,643 of 40,283 ZIP codes nationally. Within MD, it ranks 150 of 583.
Learn more
zone vs. frost date explains why Zone 7b and Baltimore's frost date answer different questions, and the frost range explains how to read the range around Baltimore's dates instead of trusting one.