Rim Rock 50 Mile Trail Challenge
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Rim Rock 50 Mile Trail Challenge
The Rim Rock 50 Mile Trail Challenge is a trail ultramarathon organized by BayTrailrunners / Trail Squirrel Adventures in Napa, California. The event is based at Skyline Wilderness Park and uses trails in the Napa Open Space Preserve and the Suscol Headwaters Trail system.
Distances
- 50 mile solo roughly 51 miles over two large loops and a final 10 km.
- 25ish mile one loop challenge approximately 25 miles.
The course is routed as roughly 2.5 rugged loops with a mix of shaded oak woodlands and exposed ridgelines. Aid stations are provided on course with water, electrolyte drinks, hydration mixes, and typical ultra foods such as fruit, PB&J, cookies, and gels. The race is cupless: runners must carry their own reusable cup, bottle, or hydration system; stations will refill personal containers.
Logistics include a designated drop bag area near the start/finish and specified crew access points. Crew access is allowed at the start/finish area and at the Lake Marie aid station only; crew is not permitted at certain aid stations. Pacers are permitted only for solo 50 mile runners after completion of the first loop and must carry their own nutrition. The event sets pacing and cutoff requirements; an average pace near 16.5 minutes per mile is noted to meet the published final cutoff.
Registration is time limited and entry fees are non-refundable and non-transferable, with limited race credit options based on notice windows. Event plans may change for safety, permitting, or trail conditions. Visit the organization's website for the most recent information.
