Mountain Lakes 100

Mountain Lakes 100

Mountain Lakes 100 is a 100 mile trail race held near Olallie Lake Resort in Oregon on September 19 and 20, 2026. The route runs largely on the Pacific Crest Trail between Mt. Hood and Mt. Jefferson and passes many mountain lakes and single track sections.

The course includes technical and rocky terrain, long stretches of single track, and sustained mountain views. The lowest point on the course is about 3,300 feet and the highest point about 5,700 feet, with approximately 11,700 feet of total elevation gain and loss. The race notes about 60 miles on the Pacific Crest Trail within the route.

Logistics and rules are specific. Field capacity is 150 and the event has a 30 hour time limit. Entry fees vary by registration window. There are no transfers and no refunds; cancellations more than 30 days before the race receive a 50 percent credit toward a future Go Beyond Racing event, cancellations 30 days or less receive no credit. All entrants and waitlisters must complete eight hours of trail work and submit a signed form by the stated deadline or risk forfeiting their spot.

Cell and internet service is very limited along the course, so live tracking at aid stations is not available. Race operations use manual tracking and HAM radio for aid station communication. The event is on National Forest land and runners may encounter horses on the multi use trail. Olallie Lake Resort offers rustic cabins, some yurts, and campgrounds; car camping in the resort parking lots is not allowed. Visit the organization's website for the most recent information.