This depends on your favorite activity since this is a true four-season destination. The best time to visit for snow-related activities is obviously the winter season where visitors can ski at Ober Gatlinburg. The most popular time to visit the Smoky Mountains is during the summer, with July drawing the most visitors. This is when the hiking, bush walking, nature trails, waterfalls, fishing, mountain biking and whitewater rafting are at their best.
During Autumn, the fall foliage is spectacular and usually peaks around mid-October. Spring can be a great time for outdoor enthusiasts since this is considered the low season so rates are great and, because of the relatively mild winters compared to further north, spring can be a very pleasant time to explore the area.