Rim Rock 50 Mile Trail Challenge
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Rim Rock 50 Mile Trail Challenge
The Rim Rock 50 Mile Trail Challenge is scheduled for May 15, 2027 in Napa, California, organized by BayTrailrunners / Trail Squirrel Adventures. The event uses Skyline Wilderness Park, Napa Open Space Preserve, and the Suscol Headwaters Trail system.
Distances offered:
- 50 mile solo (about 51 miles total)
- 25 mile one loop option
The course is routed as roughly 2.5 large loops with varied terrain: oak shaded sections, exposed ridgelines, steep climbs, and rolling singletrack. Course distance is an estimate and may be modified for trail conditions or access. Runners should plan for changing weather and for roughly half the course being shaded and half exposed.
Aid stations and on course support include water, electrolyte mixes, and gels from named suppliers, plus solid food such as fruit, PB&J, cookies, and chips at major stations. Three major aid stations will be stocked; a designated drop bag area is located near the start/finish on a blue tarp. Post race food will include wraps, salads, beverages, and vegan options. The event is cupless: participants must bring a reusable cup, bottle, or hydration system; refill support will be provided and reusable cups can be purchased.
Crew and pacer rules: crew access is limited to the Start/Finish area and Lake Marie Aid Station (about a 2 mile walk from Start/Finish); crew are not allowed at Napa Road or Suscol Headwaters aid stations. Pacers are permitted only for solo 50 mile runners after completion of the first loop and must carry their own nutrition.
Entry policies state that fees are non refundable and non transferable. Race credits may be issued at reduced percentages depending on notice period. In case of extreme conditions the event may be rescheduled or issued a partial credit. Visit the organization's website for the most recent information.
