Lost Sierra Endurance Race

About

Welcome to the 2026 Lost Sierra Endurance Race, one of California’s most scenic and demanding trail races, set in the rugged high country of the northern Sierra Nevada. Join us Saturday, July 25, 2026, in Downieville, CA for your choice of 25K, 50K, or 100K, each offering a unique journey through river canyons, alpine ridgelines, and remote singletrack. Stick around after your finish for a celebratory post-race party at the finish line.

100K

Our 100K distance is an out-n-back course starting in downtown Downieville, traveling up towards the Sierra Buttes then turning north to Plumas-Eureka State Park (PESP), Blairsden, CA where the turnaround is. There are 5 unique aid stations (a total of 9 stops along the course) with three crew access points: Aid #2, Aid #4, and Aid #5. All 100KM participants are required to carry a headlamp, space blanket, and water bottle during the race due to remoteness of the course. Pacers are allowed starting at Aid #5 / Mile 30 or at Aid #2 / Mile 47, there is no shuttle for pacers. Cutoff Time: 20 Hours (1:00AM Sunday)

50K

Our 50K distance is an point to point course starting in Plumas-Eureka State Park (PESP) in Blairsden, just outside Graeagle, traveling up towards the Sierra Buttes then turning south to Downieville where the finish is. There are 4 unique aid stations with crew access at Lavazzo Rd (mile 23). Runners will be shuttled from Downieville to PESP to start the race. Shuttle cost is $12 or you may have someone drop you off at the start. Shuttles leave at 6:00AM from Downieville. There are no shuttles from Downieville to PESP after the race.

25K

Our 25K distance is an looped course starting in downtown Downieville, traveling up through the canyons on the First, Second, and Third Divide Trails. There is a brief water stop at mile 4.2 and one formal aid station at Lavazzo Rd (mile 10).