Waldo 100K
Willamette Pass, United States • 1 Aug 2026
Waldo 100K
The Waldo 100K Ultramarathon is scheduled for August 1, 2026 in Oakridge, Oregon. The event is a 100K loop course that starts and finishes at Willamette Pass Ski Area, located at elevation 5,120 feet. The route climbs several mountains, including Fuji, The Twins, and Maiden Peak, before returning to the ski area.
The course is composed mostly of single track trails and passes through some fairly remote sections. Runners will encounter long climbs and many viewpoints overlooking Waldo Lake. The route layout is a loop rather than a point to point course.
The event is not aimed at beginners and participants are advised to enter with prior ultramarathon experience. For 2026 the event used a lottery process. When entering the lottery there was an option to contribute one dollar or more to a Trail to Zero carbon offset program, intended to help account for participant travel emissions. Visit the organization's website for the most recent information.