Union, AL 35469 Frost Dates
35469, near Union, AL: the frost window
Typically, the last spring freeze lands around 03/12, roughly 196 days out. Fall's first freeze usually shows up around 11/15, roughly 250 days after the last spring frost.
Zone 8b (15 to 20°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 Union, not a forecast for this year.
Stretching the season past the first frost
Union'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.
The actual range around Union's last frost
03/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
Union against the rest of the dataset
Union's growing season runs about 250 days, ranking 7,601 of 40,283 US ZIP codes measured here, longest to shortest. Within AL, it ranks 213 of 809.
Learn more
Two guides worth reading on 35469: zone vs. frost date, on why Zone 8b and Union's frost date answer different questions, and the frost range, on how to read the range around Union's dates instead of trusting one.