Mountain Lakes 100
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Mountain Lakes 100 : event overview
Mountain Lakes 100 is a 100-mile trail running race on the Pacific Crest Trail between Mt. Jefferson and Mt. Hood, with the start/finish area near Olallie Lake Resort. The course includes technical and rocky sections, long stretches of single track, and passes many mountain lakes and viewpoints. Total elevation change on the course is 11,700 ft of gain and loss, with a low point near 3,300 ft and a high point near 5,700 ft. The field is limited to 150 entrants and the race has a 30-hour time limit.
The event is scheduled for September 19-20, 2026. Registration opens January 1 and closes August 31. The organizer’s registration fee is listed as TBA; processing fees and taxes from the registration platform are additional. There are no transfers and no refunds; cancellations more than 30 days before the race receive a 50% credit toward a future race, and cancellations within 30 days receive no credit.
Logistics, requirements and services
This is a remote mountain event with very limited internet and cell service. There is no live tracking through aid stations; finish-line results are posted live and race operations use paper tracking and HAM radio to communicate with aid stations. All entrants and waitlisters must complete eight hours of trail work (completed after October 1 and by September 1) and submit a signed form; failure to meet this requirement may forfeit a race spot. Parking at Olallie Lake Resort is limited and carpooling is recommended. Finishers receive a belt buckle and a finisher pint glass; additional awards include special buckles for finishes under 24 hours, top finishers, age-group and non-binary awards, and raffle prizes. The race acknowledges the traditional homelands of the Molalla, Tenino, and the Confederated Tribes of the Warm Springs. Visit the organization's website for the most recent information.