Bel Air, MD 21051 Frost Dates
Frost dates for Bel Air, MD, ZIP 21051
The last spring frost here typically falls around 04/02, about 217 days from today. The first fall frost typically arrives around 11/07, about 220 frost-free days later.
Bel Air 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 Bel Air 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 Bel Air compares
About 220 days separate Bel Air's last and first frost, putting it 12,767 of 40,283 ZIP codes nationally. Within MD, it ranks 167 of 583.
Learn more
local microclimates explains what one yard in Bel Air can differ from the 21051 normal, and zone vs. frost date explains why Zone 7b and Bel Air's frost date answer different questions.