Bel Air, MD 21128 Frost Dates
Bel Air, MD: when does the frost end?
Around 04/02 is the usual last spring frost, about 217 days away. Fall's first freeze usually shows up around 11/07, roughly 220 days after the last spring frost.
Zone 7b (5 to 10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Bel Air, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Bel Air's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/02 isn't a guarantee
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/13 and only about 1 year in 10 sees frost after that.
Bel Air against the rest of the dataset
Bel Air's growing season runs about 220 days, ranking 12,770 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 170 of 583.
Learn more
Before leaning on 21128's figures: local microclimates explains what one yard in Bel Air can differ from the 21128 normal, while zone vs. frost date explains why Zone 7b and Bel Air's frost date answer different questions.