Prepare for an unforgettable journey into the heart of the Oregon Cascades at the Waldo 100K, taking place on August 1, 2026. Starting and finishing at the Willamette Pass Ski Area at an elevation of 5,120 feet, this challenging 100-kilometer (62.5-mile) loop is renowned for its immense beauty and demanding terrain. Runners will traverse over 11,000 feet of elevation gain and loss across mostly pristine singletrack trails, conquering three major peaks—Fuji, The Twins, and Maiden Peak (the course high point at 7,818 feet). The course winds through lush Pacific Northwest forests of towering Douglas fir and redcedar, past no fewer than six stunning mountain lakes, and offers incredible views of the namesake Waldo Lake from its high points. Be prepared for remote sections, especially in the second half of the course where roads are absent for over 25 miles, demanding self-sufficiency in the mountains. Typical race day conditions in early August bring highs around 82°F and lows around 52°F, with a minimal 2% chance of precipitation, though past events have seen variable conditions including smoke from wildfires.

The Waldo 100K holds a cherished reputation as one of the Pacific Northwest's original and most unique ultras, often described as having an "old-school, boutique-ultra feel." It draws runners back year after year not just for the rigorous course, but for its vibrant community and dedicated volunteers who contribute to an atmosphere of "endless and soul-nourishing good vibes." With nine aid stations positioned 4.9 to 7.5 miles apart, including remote hike-in stations stocked via backpack, horseback, or wheelbarrow, runners are well-supported. However, it's a cupless race, requiring participants to carry their own reusable cups or bottles. Adding to its quirky charm are unique awards like "Find Waldo" for the first runner to summit Fuji Mountain and finish, "Wet Waldo" for those who submerge themselves in the most lakes, and "Show Us Your Waldo" for the best race spirit. Known for being well-organized with enthusiastic support, the Waldo 100K is a challenging mountain ultra highly recommended for experienced trail runners seeking an immersive and memorable adventure.