Lost Sierra Endurance Race
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Lost Sierra Endurance Race
The Lost Sierra Endurance Race is a trail running event in and around Downieville, California on July 25, 2026. It offers multiple distances over primarily singletrack trails and uses aid stations along the routes.
Distances:
- 100 km: out-and-back to Plumas-Eureka, 10,780 ft elevation gain.
- 50 km: point-to-point from Plumas-Eureka to Downieville, 5,360 ft elevation gain.
- 25 km: loop from Downieville, mostly singletrack, 2,330 ft elevation gain.
Course and support details include five unique aid stations stocked with water, hydration mix, and light food; Aid 1, Aid 2, and Aid 5 also offer warm food. The 25 km uses Aid 1, the 50 km uses Aid 1-4, and the 100 km uses Aid 1-5. Ice is available at all aid stations though supply at the most remote station may be limited. Drop bag access is available for 50 km at Aid 2 and for 100 km at Aid 2 and Aid 5. Trekking poles are allowed.
The 100 km requires a space blanket, pack or hydration vest, and a headlamp. Pacers are permitted for 100 km runners on the return at Aid 5 or Aid 2; only one pacer may accompany a runner at a time and no pacer shuttles are provided. Trail surface is roughly 70% alpine singletrack, 20% mountain bike singletrack, and 10% dirt, gravel, or paved road.
Accommodations in Downieville are limited. The event has a no-refund policy with rollover credit available on a sliding scale depending on cancellation timing. Visit the organization's website for the most recent information.