St. Marys, GA 31547 Frost Dates
Frost dates for St. Marys, GA, ZIP 31547
Typically, the last spring freeze lands around 02/19, roughly 175 days out. The first fall frost typically arrives around 12/14, about 299 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 St. Marys, not a forecast for this year.
What to do before the first frost
Zone 9a around St. Marys has about 15 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.
How much risk comes with planting early here
02/19 is the middle of 30 years of NOAA records, not a promise. Plant by 01/19 and you're betting against frost in roughly 9 years out of 10. 03/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Marys compares
About 299 days separate St. Marys's last and first frost, putting it 4,160 of 40,283 ZIP codes nationally. Within GA, it ranks 9 of 921.
Learn more
the frost range explains how to read the range around St. Marys's dates instead of trusting one, and local microclimates explains what one yard in St. Marys can differ from the 31547 normal.