Rim Rock 50 Mile Trail Challenge
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Event overview
The Rimrock 50 Mile Trail Challenge is scheduled for May 16, 2026 in Napa, California, based at Skyline Wilderness Park. The event offers these race categories:
- 50 mile solo
- 50 mile relay
Camping is available at Skyline Wilderness Park for May 15–17, 2026. A designated drop bag area will be located near the start/finish line.
Course, support and policies
The course uses trails in Skyline Wilderness Park, the Napa Open Space Preserve, and the Suscol Headwaters Trail system. The route is described as two loops of approximately 26 miles each; solo runners complete both loops (about 52 miles total), while relay teams of two each complete one loop. There is a 13-hour total course cutoff; on two-person relay teams, each runner has 6.5 hours to finish their section. Four aid stations will be staffed and stocked with snacks, fruit, hydration, and typical ultrarunning supplies; post-race food includes burrito wraps, salads, fruit, and beverages. The event is cupless: all participants must carry a reusable cup, bottle, or hydration pack for aid station refills. Crew access is allowed at the start/finish area and at the Lake Marie Aid Station only; crew access is not permitted at Napa Road or the Suscol Headwaters aid stations. Pacers are permitted only for solo runners on the final loop and are not allowed for relay teams. Visit the organization's website for the most recent information.