Trillium Gap Trail starts off the Roaring Fork Nature Trail. A few steps down it, the Old Sugarlands Trail veers to the right. The Trillium Gap Trail runs 2.9 miles up Brushy Mountain, where at the top you can go three different ways. Before you get to the top, Trillium Gap Trail runs by Grotto Falls. Grotto Falls is one of the most visited waterfalls in the park. It is about a mile away from the parking lot.
At the top of Brushy Mountain, you can go three different ways. To the left, there is a 0.4-mile trail leading to the very top of the Mountain. To the right, there is a 3.6-mile trail that takes you to Mount Le Conte. Going straight puts you on the 4.5-mile Brushy Mountain Trail, which leads toward the Greenbrier Area.