Mobile, AL 36628 Frost Dates
Frost dates for Mobile, AL, ZIP 36628
Around 03/03 is the usual last spring frost, about 187 days away. The first fall frost typically arrives around 11/25, about 268 frost-free days later.
Zone 9a (20 to 25°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 Mobile, not a forecast for this year.
What to do before the first frost
Zone 9a around Mobile has about 13 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.
Why 03/03 isn't a guarantee
03/03 is the middle of 30 years of NOAA records, not a promise. Plant by 02/06 and you're betting against frost in roughly 9 years out of 10. 03/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mobile compares
Mobile's growing season runs about 268 days, ranking 5,713 of 40,283 US ZIP codes measured here, longest to shortest. Within AL, it ranks 60 of 809.
Learn more
zone vs. frost date explains why Zone 9a and Mobile's frost date answer different questions, and the frost range explains how to read the range around Mobile's dates instead of trusting one.