Birmingham, AL 35222 Frost Dates
Birmingham, AL: when does the frost end?
Typically, the last spring freeze lands around 03/21, roughly 205 days out. Fall's first freeze usually shows up around 11/11, roughly 236 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Birmingham in Zone 8a (10 to 15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 11 weeks until Birmingham's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/21 isn't a guarantee
03/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/08 and only about 1 year in 10 sees frost after that.
Birmingham against the rest of the dataset
Birmingham's growing season runs about 236 days, ranking 9,221 of 40,283 US ZIP codes measured here, longest to shortest. Within AL, it ranks 354 of 809.
Learn more
Before leaning on 35222's figures: zone vs. frost date explains why Zone 8a and Birmingham's frost date answer different questions, while the frost range explains how to read the range around Birmingham's dates instead of trusting one.