Top 10 Colorado Fall Destinations Hiker’s Fall Guide To Colorado Not many people enjoy watching summer fade away, but when the leaves change color, there’s a whole new reason to welcome the changing seasons. Here’s a few of the must-see locations Colorado has to offer: Rainbow Gulch This 2.6 mile trail guides you along a stream leading to Rampart Reservoir, home to some of the most beautiful aspen groves. The Trailhead, located off Rampart Range Road, is roughly a 45 minute d