Rim Rock 50 Mile Trail Challenge
Napa, United States • 15 May 2027
Rim Rock 50 Mile Trail Challenge
The Rim Rock Trail Challenge is a trail ultramarathon in Napa Valley that uses trails in Skyline Wilderness Park, the Napa Open Space Preserve, and the Suscol Headwaters Trail system. The course follows roughly 2.5 loops through oak-shaded sections and exposed ridgelines, with significant climbs and varied terrain. The published route is an estimate and may be modified for trail conditions or permit reasons.
Distances
- 50 mile (solo) : two large ~22-mile loops plus an additional 10k loop, about 51 miles total.
- 25 mile (one-loop) : a single loop of approximately 25 miles.
Aid stations are stocked with hydration products and gels, fruit, sandwiches, and other common ultrarunning food. The event is run as a cupless race; participants must carry their own reusable cup, bottle, or hydration system. A drop bag area is located near the start/finish line.
Crew and pacer rules are specified: crew access is allowed at the Start/Finish area and at the Lake Marie aid station only; crew access is restricted at other aid stations. Pacers are permitted for solo 50-mile runners only after the first loop and must carry their own nutrition.
Entries are non-refundable and non-transferable; partial race credits may be issued on a sliding scale when requested within published timeframes. Race organizers reserve the right to alter course details or cancel for safety reasons. Visit the organization's website for the most recent information.