Union, AL 35480 Frost Dates
Frost dates for Union, AL, ZIP 35480
Around 03/12 is the usual last spring frost, about 196 days away. The first fall frost typically arrives around 11/15, about 250 frost-free days later.
The USDA Plant Hardiness Zone Map puts Union in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 8b around Union has about 11 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Union's last frost
03/12 is the middle of 30 years of NOAA records, not a promise. Plant by 02/22 and you're betting against frost in roughly 9 years out of 10. 04/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Union compares
Union's growing season runs about 250 days, ranking 7,602 of 40,283 US ZIP codes measured here, longest to shortest. Within AL, it ranks 214 of 809.
Learn more
local microclimates explains what one yard in Union can differ from the 35480 normal, and zone vs. frost date explains why Zone 8b and Union's frost date answer different questions.