Waldo 100K
Always double-check with the organizer's website! This page may contain affiliate links.
Waldo 100K
The Waldo 100K Ultramarathon is a loop course near Oakridge, Oregon. The route begins at Willamette Pass Ski Area at elevation 5120', about 70 miles east of Eugene, Oregon.
The course climbs several mountains, including Fuji, The Twins, and Maiden Peak. The route is mostly single track trails with some fairly remote sections and many views of Waldo Lake. The event includes extended trail sections and high elevation terrain.
The race is not a beginner level ultra and the organizers recommend that entrants have prior experience. The 2026 edition used a lottery to select entrants and the event participates in a Trail to Zero carbon offset program where lottery registrants could contribute one dollar or more to offset event related travel emissions. Visit the organization's website for the most recent information.
