Waldo 100K
Willamette Pass, United States • 1 Aug 2026
Waldo 100K - Oakridge, OR (August 1, 2026)
The Waldo 100K is a 100 kilometre loop trail race held near Oakridge, Oregon, with the start and finish at Willamette Pass Ski Area at elevation 5120 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 includes some fairly remote sections. Runners will encounter multiple viewpoints of Waldo Lake along the route. The event is not intended for first-time ultramarathon runners; prior trail ultra experience is recommended.
The 2026 field used a lottery process and the event's registration closed on January 21, 2026. The race participates in a Trail to Zero carbon offset program; when entering the lottery registrants were offered the option to contribute one dollar or more to support a climate-action project and offset travel-related emissions. Visit the organization's website for the most recent information.