Waldo 100K
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Waldo 100K Ultramarathon
The Waldo 100K Ultramarathon is a loop-type trail race covering 100K that begins and ends at Willamette Pass Ski Area, located about 70 miles east of Eugene, Oregon. The course starts at elevation 5120 feet and climbs over several mountains including Fuji, The Twins, and Maiden Peak before returning to the ski area. The route is mostly single track trails and includes fairly remote sections and extensive views of Waldo Lake.
The event is a Western States 100-Mile Endurance Run qualifier with an 18 hour standard and is listed as a UTMB Index race for UTMB, CCC, and OCC. Waldo Ultras, a 501(c)(3) non-profit corporation, organizes the race under a special use permit with Willamette and Deschutes National Forests and describes itself as an equal opportunity outdoor recreation service provider. For future editions the race has used a lottery registration; for example, lottery registration is listed for January 1–21, 2027 with a drawing on January 22, 2027. Participation is explicitly not intended for beginners and should be undertaken with appropriate preparation. Visit the organization's website for the most recent information.
