Hartselle, AL 35640 Frost Dates
35640, near Hartselle, AL: the frost window
Around 03/26 is the usual last spring frost, about 210 days away. Fall's first freeze usually shows up around 11/07, roughly 228 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hartselle 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
Hartselle's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 03/26 isn't a guarantee
03/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/09 and only about 1 year in 10 sees frost after that.
Hartselle against the rest of the dataset
At roughly 228 frost-free days, Hartselle places 10,768 of 40,283 ZIP codes in this dataset. Within AL, it ranks 549 of 809.
Learn more
Two guides worth reading on 35640: zone vs. frost date, on why Zone 8a and Hartselle's frost date answer different questions, and the frost range, on how to read the range around Hartselle's dates instead of trusting one.