The leaves are already changing in Columbia County. If you want to know when the peak leaf-peeping time is in your area? Check out the 2019 Fall Foliage Map. Each year, SmokyMountains.com publishes this interactive, online map that bills itself as the ultimate visual planning guide to the annual progressive changing of the leaves. On their site, you can use the slider under the map of the US to see when the leaves will be at their peak across the country.
Check out the map now, at smokymountains.com/fall-foliage-map