Mobile, AL 36691 Frost Dates
Frost dates for Mobile, AL, ZIP 36691
Typically, the last spring freeze lands around 03/03, roughly 187 days out. The first fall frost typically arrives around 11/25, about 268 frost-free days later.
The USDA Plant Hardiness Zone Map puts Mobile in Zone 9a (20 to 25°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 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.
The actual range around Mobile's last frost
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 5,726 of 40,283 US ZIP codes measured here, longest to shortest. Within AL, it ranks 73 of 809.
Learn more
local microclimates explains what one yard in Mobile can differ from the 36691 normal, and zone vs. frost date explains why Zone 9a and Mobile's frost date answer different questions.