Located along the Trillium Gap Trail – off the Roaring Fork Motor Nature Trail – Grotto Falls is a nearly 3-mile, out-and-back hike that runs behind a 25-foot waterfall. It's the only ...

The Roaring Fork Motor Nature Trail, a nearly 6-mile-long ... to two of the region's most popular waterfalls: Rainbow Falls and Grotto Falls. Along the loop, you'll see historic log cabins ...

and is great for hikers or trail runners looking to get away from other people. What’s special about Grotto Falls is you can walk behind it’s 100 foot cascade, which is fed by the Little River.