Lost Sierra Endurance Race
Always double-check with the organizer's website! This page may contain affiliate links.
Lost Sierra Endurance Race - July 25, 2026
The Lost Sierra Endurance Race takes place in and around Downieville, California. The event offers three trail distances:
- 100K - out-and-back course via Third Divide, Pacific Crest Trail, and Lakes Basin Trails.
- 50K - point-to-point from Plumas-Eureka State Park to Downieville.
- 25K - loop starting and finishing in Downieville through canyon trails.
Course features and logistics
The courses are mainly singletrack with rocky, rooty sections and some dirt/gravel road. Reported elevation gain is approximately 10,780 ft for the 100K, 5,360 ft for the 50K, and 2,330 ft for the 25K. There are five unique aid stations on the overall route; supplies include water, hydration mix, light food, and ice (aid #3 may have limited ice). Aid #1, #2, and #5 are noted to offer warm foods. The 25K uses Aid #1; the 50K uses Aid #1-4; the 100K uses Aid #1-5.
Cutoff windows are published: 25K six hours, 50K ten hours, and 100K twenty hours. A shuttle is provided to the 50K start at Plumas-Eureka State Park for a fee; participants may also arrange private drop-off. Mandatory gear for 100K participants includes a pack or hydration vest, a space blanket, and a headlamp. Trekking poles are allowed. Pacers are permitted only for 100K runners on the return at specified aid stations; no event shuttle is provided for pacers. Drop bag access is available at specified aid stations for 50K and 100K runners. Visit the organization's website for the most recent information.