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Waldo 100K

Name: Waldo 100K
Start: 2026-08-01
End: 2026-08-01
Location: Willamette Pass

Willamette Pass, United States • 1 Aug 2026

Waldo 100K Ultramarathon

The Waldo 100K is an ultramarathon on a 100-kilometer loop course. It starts and finishes at the Willamette Pass Ski Area, located about 70 miles east of Eugene, Oregon. The start is at an elevation of 5,120 feet.

The course climbs several mountains, including Fuji, The Twins, and Maiden Peak. The route is mostly on single-track trails, with some remote sections. It offers views of Waldo Lake. The organizers state it is not a beginner-level ultramarathon and recommend participants have prior experience.

In 2026, the event used a lottery system for registration.

The event is part of Ultrasignup's Trail to Zero™ carbon offset program. During lottery registration, participants can optionally contribute one dollar or more to this program to offset travel-related emissions. Visit the organization's website for the most recent information.

United States Oregon Willamette Pass

Race information

Website

UTMB 100K

Waldo 100k

Visit the organization's website for the most recent information.

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Oakridge Triple Summit Challenge

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Ragnar Trail South Cascades

Cascade Summit

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Experience a team relay through the rugged peaks and alpine lakes of Oregon’s Willamette Pass. Choose between full relay or sprint formats while enjoying a vibrant race village and stunning views of the Cascades.