Mountain Lakes 100

Mountain Lakes 100 is Oregon’s scenic 100‑mile ultramarathon staged at Olallie Lake. Runners cover a looped course that includes roughly 60 miles of the Pacific Crest Trail, weaving through dozens of lakes with mountain views and a mix of technical rocky sections. The event is renowned for its strong support, with well‑stocked aid stations and experienced volunteers dedicated to guiding competitors to the finish. It’s not a lottery entry and serves as a Western States 100 qualifier, with a 150‑runner cap. A required 8 hours of trail work between the previous year and race year emphasizes trail stewardship, under Go Beyond Racing. Visit the organization's website for the most recent information.