Depends on what you mean by "plant."
You can start them indoors anytime, under lights, and keep them going until you're ready to transplant.
Check with your extension service or weather office to find out your average last frost. Then plan on planting in the ground no earlier than two weeks after that. I'm guessing that would be mid-April in the Atlanta area.
Although there are exceptions, most herbs are delicate, and you don't want to plant them in cold ground. Root shock will kill 'em in a heartbeat.
However, if you've got them in tubs or pots, you can move them in and out as appropriate.
On the other hand, virtually all perennial herbs will winter over down there. So, once you have things like rosemary, lavender, and the mints established they'll do fine all by themselves.
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