Mulga, AL 35237 Frost Dates
35237, near Mulga, AL: the frost window
Around 03/21 is the usual last spring frost, about 205 days away. 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 Mulga 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
Mulga's growing season runs out in roughly 11 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
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.
Mulga against the rest of the dataset
About 236 days separate Mulga's last and first frost, putting it 9,476 of 40,283 ZIP codes nationally. Within AL, it ranks 400 of 809.
Learn more
Two guides worth reading on 35237: zone vs. frost date, on why Zone 8a and Mulga's frost date answer different questions, and the frost range, on how to read the range around Mulga's dates instead of trusting one.