Waldo 100K

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.