The highest paved marathon in the world -- and one of the most scenic. Our USA Track & Field certified course takes you on a spirit-soaring tour of the majestic Estes Valley, gateway to Rocky Mountain National Park. Destined to become the world's premier high-altitude marathon for athletes of all abilities. 8-hour course limit! We're walker and wheelchair friendly. With a variety of races to choose from, this is a weekend you won't want to miss!.