Lost Sierra Endurance Race

The Lost Sierra Endurance Race, is a thrilling endurance experience set against the stunning backdrop of the Sierra Buttes in Downieville, CA, taking place on July 26th, 2025. Choose your challenge with our 25K, 50K, and 100K races, each offering a unique journey through the heart of the Sierra Nevada mountains. To celebrate your finish, join us for a post race BBQ right at the finish line. The flagship 100K race embarks on an out-and-back adventure, navigating the scenic Third Divide Trails, Pacific Crest Trail, and Lakes Basin Trails. This challenging course leads runners from the charming town of Downieville, CA, to Blairsden, CA, offering panoramic views of the northern Sierra Nevada mountains. For those opting for the 50K race, the adventure begins at Plumas-Eureka State Park in Blairsden, CA, traversing the same awe-inspiring course of lake valleys, alpine ridge lines, and river canyons to then finish in downtown Downieville. New for this year, the 25K race starts and ends in Downieville. This course is relatively easy, making it perfect for those looking for a less demanding yet equally beautiful experience through the river canyons.