High Lonesome Loop (CO)

Boulder County, Colorado, United States

14.5 miles (23.4 km) · 3,219 ft elevation gain · Loop · trail · Route

High Lonesome Loop (CO) covers 14.5 miles across Boulder County, Colorado, United States. Runners face 3,219 feet of climbing with 3,097 feet of loss. The most significant ascent covers 3.6 miles and gains 1,061 feet. Vertical rate measures 222 feet of gain per mile. The course is 58% runnable, with the remainder requiring hiking on steep or technical sections. Trail comprises the majority of the course. Technical difficulty: mountainous. This route ranks at the 93.79th percentile for difficulty among similar distances. Popular among trail runners and hikers seeking Colorado adventures.