Alpharetta, GA 30005 Frost Dates
When can you plant in Alpharetta, GA?
Around 03/25 is the usual last spring frost, about 209 days away. The first fall frost typically arrives around 11/09, about 228 frost-free days later.
Zone 8a (10 to 15°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 Alpharetta, not a forecast for this year.
What to do before the first frost
About 10 weeks of growing season left in Alpharetta before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
03/25 is the middle of 30 years of NOAA records, not a promise. Plant by 03/05 and you're betting against frost in roughly 9 years out of 10. 04/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Alpharetta compares
Alpharetta's growing season runs about 228 days, ranking 10,701 of 40,283 US ZIP codes measured here, longest to shortest. Within GA, it ranks 567 of 921.
Learn more
local microclimates covers what one yard in Alpharetta can differ from the 30005 normal. zone vs. frost date covers why Zone 8a and Alpharetta's frost date answer different questions.