Lost Sierra Endurance Race

Lost Sierra Endurance Race

The Lost Sierra Endurance Race takes place in and around Downieville, California on July 25, 2026. The event offers three trail distances and distinct course formats:

• 25K loop in the Downieville canyons, mostly single track, 2,330 ft elevation gain, 6 hour cutoff.
• 50K point to point from Plumas-Eureka State Park to Downieville, 5,360 ft elevation gain, shuttle option for a fee, 10 hour cutoff.
• 100K out-and-back from Downieville to Plumas-Eureka State Park and return, 10,780 ft elevation gain, 20 hour cutoff.

Aid stations: five unique aid stations supply water, hydration mix, and light food; Aid 1, 2, and 5 offer warm foods. Ice is provided but may be limited at Aid 3. The 25K uses Aid 1, the 50K uses Aids 1 to 4, and the 100K uses Aids 1 to 5. Drop bag access is available for 50K runners at Aid 2 and for 100K runners at Aid 2 and Aid 5.

Trails and terrain: roughly 70% alpine singletrack, 20% mountain bike singletrack, and 10% dirt, gravel, or paved road. The 100K requires a vest or pack, a space blanket, and a headlamp. Trekking poles are permitted. Pacers are allowed only for 100K runners on the return at Aid 5 or Aid 2; there are no shuttles for pacers.

Logistics and notes: Downieville has limited lodging and camping options. Tent camping at the start area is permitted but this is not a campground and offers no firepits, designated parking, or bear boxes. Registration credits and refund policies include a rollover schedule and a pregnancy exception for deferral or refund when requested at least seven days before the event.

Swag and awards: all runners receive a tee shirt; 25K and 50K finishers receive custom wood medals and 100K finishers receive a custom bronze belt buckle. Top finishers receive plaques or standing awards and the 100K last finisher receives a unique medal. Visit the organization's website for the most recent information.