Rim Rock 50 Mile Trail Challenge

Rim Rock 50 Mile Trail Challenge

The Rim Rock 50 Mile Trail Challenge is a trail running event in Napa, California, held at Skyline Wilderness Park on May 15, 2027. The event uses trails in Skyline Wilderness Park, the Napa Open Space Preserve, and the Suscol Headwaters Trail system.

Distances

• 50 mile solo, about 51 miles total, two ~22 mile loops plus a final 10k loop
• 25 mile one-loop challenge, approximately 25 miles

The course is multi-loop and largely off-road, with rolling terrain, sustained climbs, oak-shaded sections, and exposed ridgelines. Weather can vary on race day; mornings may be foggy and cool while afternoons may be hot. Approximately half the course is shaded by oak trees and the other half is exposed. The route may be adjusted before race day due to trail or access conditions.

Aid stations: four stations are planned, with three major stations stocked with hydration, gels, fruit, PB&J sandwiches, cookies, and other typical ultra fare. Hydration products named in event information include Skratch, Cure Hydration, and GU gels. The event is cupless; runners must carry a reusable cup, bottle, or hydration pack. Aid stations will refill personal containers.

Crew and pacer policies are specified: crew access is limited to Start/Finish and Lake Marie Aid Station; crew are not allowed at some aid stations. Pacers are permitted only for solo 50 mile runners after the first loop and must carry their own nutrition.

Logistics notes: drop bags are available near Start/Finish, and the event uses a separate event gate and overflow parking at Skyline Wilderness Park. Registered runners receive a technical shirt and finishers receive a hat; top finishers and age group awards are described in the event information. Visit the organization's website for the most recent information.