Rim Rock 50 Mile Trail Challenge

Rim Rock 50 Mile Trail Challenge : Skyline Wilderness Park, Napa Valley

The Rim Rock 50 Mile Trail Challenge is a trail ultramarathon held at Skyline Wilderness Park in Napa, CA on May 15, 2027. The event offers two distance options:

• Solo 50 mile (about 51 miles total; 2.5 loops)
• One-loop Mini Rim Rock (about 25 miles)

The course uses Skyline Wilderness Park, Napa Open Space Preserve, and Suscol Headwaters Trail. It consists of two large loops of roughly 22 miles each, followed by a final 10k loop. Terrain includes oak-shaded trails, exposed ridgelines, rolling hills, and sustained climbs. The route may be modified before race day for trail or permitting reasons.

Aid stations and on-course support are provided at multiple locations and include water, electrolyte drinks, Skratch and Cure hydration, GU gels, fruit, PB&J, cookies, and other snacks. The event is cupless; runners must carry a reusable cup, bottle, or hydration pack. A designated drop bag area is located near the start/finish and is marked with a blue tarp.

Crew and pacer rules: crew access is limited to the start/finish area and Lake Marie Aid Station; crew are not permitted at Napa Road or Suscol aid stations. Pacers are allowed only for solo 50-mile runners after the first loop and are not permitted for relay teams. Pacers must carry their own nutrition.

Logistics include bib pickup at the registration tent, finisher swag and shirts distributed at the finish, an event gate with overflow parking prior to the main park entrance, and a $6 fee if entering through the main park gate. Entry fees are non-refundable and non-transferable; partial race credits may be issued on notice and are valid for one year. Photos will be available to view at no charge with an option to purchase high-resolution images. Volunteers receive a race shirt and a meal. Visit the organization's website for the most recent information.