Lost Lakes

Managing agency

Pike-San Isabel NF — South Platte RD

Lost Lakes is a 19.6-mile out-and-back trail located in Colorado near Colorado, managed by Pike-San Isabel National Forest's South Platte Ranger District. The route features 2,175 feet of elevation gain, making it a moderately strenuous day hike or backpacking option. The trail traverses Pike-San Isabel National Forest terrain, offering access to alpine lakes in the region. The out-and-back format allows hikers to customize their experience by turning around at any point, though the full distance provides a substantial workout with consistent elevation gain throughout the journey. This trail is best suited for hikers with intermediate to advanced fitness levels due to the length and elevation gain. Expect to spend a full day on the trail, with the round-trip distance requiring careful planning regarding daylight hours and water availability. The South Platte Ranger District manages this area, so check with Pike-San Isabel National Forest for current trail conditions, seasonal closures, and any permit requirements before visiting. Weather in the Colorado mountains can change rapidly, so prepare accordingly for alpine conditions.