Mountain Lakes 100

Mountain Lakes 100

Mountain Lakes 100 is a 100 mile trail race centered at Olallie Lake Resort in Oregon. The route follows large sections of the Pacific Crest Trail between Mount Hood and Mount Jefferson, running past dozens of mountain lakes and long stretches of single track. The course includes technical and rocky sections, extensive trail surfaces, and sustained mountain views. About 60 miles of the route use the Pacific Crest Trail. The course total includes approximately 11,700 feet of elevation gain and loss, with low and high points near 3,300 and 5,700 feet elevation.

The event is scheduled for September 19–20, 2026, and has a 30 hour time limit. Capacity is limited to 150 entrants. There are no transfers and no refunds; cancellations more than 30 days before the race receive a 50 percent credit toward a future race, while cancellations 30 days or less from the race do not receive credit.

Entrants and waitlisters must complete eight hours of trail work sometime after October 1 and by September 1; confirmation is required by the stated deadline or the entry may be forfeited. On-course runner tracking is manual and aided by HAM radio at aid stations, and there is very limited cell or internet service along much of the course.

Olallie Lake Resort offers rustic cabins, yurts, and campgrounds, but parking is tight and some campgrounds have limited availability following past fires. The race acknowledges the traditional homelands of the Molalla Tribe, Tenino Tribe, and the Confederated Tribes of the Warm Springs. Visit the organization's website for the most recent information.

Events nearby