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Waldo 100K

Oakridge, United States • 2 Aug 2025

The Waldo 100K Ultramarathon is a demanding 100K race set in the scenic Willamette Pass Ski Area in Oakridge, Oregon. The course features a loop that ascends several mountains, including Fuji, The Twins, and Maiden Peak, offering breathtaking views of Waldo Lake. Primarily consisting of single-track trails, this event is designed for experienced ultrarunners. The race also participates in the Trail to Zero™ program, allowing participants to contribute to carbon offset initiatives. Registration for the 2025 event closed on January 21, 2025, following a lottery held on January 22, 2025. Visit the organization's website for the most recent information.

United States Oregon Oakridge

Race information

Website
UTMB 100K
100 km
2890 m+
Waldo 100k
Visit the organization's website for the most recent information.
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