I was at Sweetwater Creek State Park this past weekend which is just South of I-20, West of Atlanta. This is what the trees looked like along the hiking trail....
So my guess would be you have missed the peak in Dahlonega for this year. There MIGHT be a few varieties of trees that are stragglers for color due to all the rain we've had, but many will have already lost most of their leaves.
Here's the site for the Dahlonega visitor's center. There's a phone number on it. I'm sure if you call they'll be able to tell you how the leaves are up there now:
Dahlonega Convention & Visitors Bureau