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Lottery registration for the August 5, 2023 Waldo 100K will be open from January 1 to January 21, 2023 at ultrasignup. The lottery drawing will take place on January 22, 2023.

2022 Results

2022 Land Acknowledgement

The Waldo 100K Ultramarathon is a challenging 100K loop-type course starting at Willamette Pass Ski Area (70 miles east of Eugene, Oregon) at elevation 5120′, climbing up several mountains including Fuji, The Twins, and Maiden Peak before returning to the ski area. The route is mostly single-track trails with some fairly remote sections and has many incredible views of pristine Waldo Lake. It is not a beginner-level ultra and participation in the race should not be taken lightly.

A Western States® 100-Mile Endurance Run Qualifier


Waldo Ultras is a 501(c)(3) non-profit corporation that conducts the Waldo 100K which
operates under a special use permit with Willamette and Deschutes National Forests,
and is an equal opportunity outdoor recreation service provider.