Lost Sierra Endurance Race

Downieville, United States • 25 Jul 2026

Event overview

The Lost Sierra Endurance Race takes place Saturday, July 25, 2026, in Downieville, CA. Distances offered are:

  • 100K - Out-and-back, Downieville to Plumas-Eureka State Park turnaround.
  • 50K - Point-to-point, Plumas-Eureka State Park to Downieville.
  • 25K - Loop course starting and finishing in Downieville.

Registration closes Thursday, July 23, 2026 at 11:59 PM PT. A post-race party is held at the finish area.

Courses and logistics

100K: Out-and-back route using Third Divide, Pacific Crest Trail, and Lakes Basin Trails. Listed aid stations occur at miles 5.3, 15.2, 20.1, 25.6, 29.8 (turnaround) and the corresponding return miles; five unique aid stations and nine total stops are noted. Mandatory items for 100K include a headlamp, space blanket, and a vest or pack; a water bottle is also referenced. Pacers are allowed on the return at Aid #5 (about Mile 30) or Aid #2 (about Mile 47); there is no event shuttle for pacers. Cutoff for the 100K is 20 hours.

50K: Point-to-point from Plumas-Eureka State Park into Downieville. Four unique aid stations are listed; crew access is available at Lavazzola Road (about mile 23). Runners are shuttled from Downieville to the 50K start; shuttle cost is $12. Cutoff for the 50K is 11 hours.

25K: Loop on First, Second, and Third Divide Trails with a water stop at mile 4.2 and a formal aid station at Lavazzola Road (mile 10.9). All distances permit use of running poles.

The event notes a community donation program that matches participant donations up to specified limits and lists several nonprofit partners. Visit the organization's website for the most recent information.

Race information

100 km
100k
50 km
50k
25 km
25k
Visit the organization's website for the most recent information.
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