Welcome to the 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 in Downieville, CA for your choice of 25K, 50K, or 100K, each offering a unique journey through river canyons, alpine ridgelines, …
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Welcome to the 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 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.
The flagship 100K is no ordinary ultra, it’s one of the hardest 100Ks in California. This out-and-back route follows the legendary Third Divide, Pacific Crest Trail, and Lakes Basin Trails, climbing thousands of feet from historic Downieville to Johnsville / Blairsden and back. Expect a raw, remote, and wildly scenic adventure that will push you to your limit.
The 50K begins at Plumas-Eureka State Park and follows the same stunning terrain back to Downieville, delivering a tough and technical point-to-point experience with mountain lakes, granite ridges, and dense forest trails.
The 25K starts and finishes in Downieville, offering a more approachable course through the lower river canyons, ideal for runners looking to sample the region’s beauty without the full ultra challenge.
Join us for the annual Lost Sierra Endurance Race, where every mile is earned and every view is unforgettable.
Presented by: Bad Luck Run Club
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
50K & Shuttle
Our 50K distance is a 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 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).
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