Prepare for an unparalleled journey into the heart of the Sierra Nevada at the Lost Sierra Endurance Race, taking place on July 25, 2026, in the charming mountain town of Downieville, CA. Choose your challenge from the grueling 100K, the demanding 50K, or the scenic 25K distances. Runners consistently praise the "brutal, beautiful, and unforgettable" trails, offering a mix of rocky and smooth single track that winds through stunning alpine ridge lines, lake valleys, and river canyons. The 100K, an out-and-back adventure, boasts an impressive 10,780 feet of elevation gain, traversing the Pacific Crest Trail and Lakes Basin. The 50K, a point-to-point race starting at Plumas-Eureka State Park, climbs 5,360 feet through two major ascents before a long descent to the finish. Even the 25K, a looped course starting and ending in Downieville, offers a beautiful, less demanding experience through the canyons with 2,330 feet of elevation gain. Typical race day conditions in late July see highs around 90F and lows around 53F, with generally dry weather, perfect for high-country running.

Organized by the Bad Luck Run Club, this event is celebrated for its challenging courses and vibrant atmosphere, quickly gaining a reputation among ultra-runners since its debut. Aid stations are strategically placed and fully stocked with water, hydration mix, light food, and ice, with some even offering warm meals for the longer distances. The 100K features nine aid stops and three crew access points, while 50K and 100K runners can utilize drop bags at designated stations. Finishing back in downtown Downieville, runners are greeted with a post-race BBQ and the palpable excitement of the community, known for its unique charm and hospitality. While challenging, with past runners recommending trekking poles and course map downloads, the Lost Sierra Endurance Race promises an immersive experience with constant high Sierra running and unforgettable panoramic views.