The Colorado Trail is a classic thru-hike in the U.S. There is an interesting backstory of how it came to be. A woman named Gudy Gaskill is the key figure associated with creating the Colorado Trail. To give an overview, the Colorado Trail runs from Denver to Durango, or vice versa. It traverses about 500 miles of Colorado’s various wilderness areas and forests. It runs through a couple very well known areas of the state such as the Collegiate Peaks Wilderness and San Juans of Southern Colorado. It is a very well maintained trail that is well marked the whole way.