Rim Rock 50 Mile Trail Challenge
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About the race
The Rim Rock 50 Mile Trail Challenge is a trail ultramarathon held at Skyline Wilderness Park in Napa, California. The event uses trails in Skyline Wilderness Park, the Napa Open Space Preserve, and the Suscol Headwaters Trail System. The advertised course consists of roughly two and a half rugged loops, with each large loop near 22 miles and a shorter final loop of about 10k; solo runners complete both large loops for about 51 miles total. Trail surfaces range from shaded oak forest to exposed ridgelines and rolling open hills, and participants should expect varied weather and temperature changes through the day.
Distances offered
- ~50 miles solo (about 51 miles)
- ~25 miles one-loop option
Aid stations and on-course support provide water, electrolyte drinks, Skratch and Cure Hydration, GU gels, fruit, PB&J sandwiches, cookies, and salty snacks. The event is cupless: all runners must carry a reusable cup, bottle, or hydration system; aid stations will refill personal containers and reusable cups can be purchased if needed. Crew access is allowed at the Start/Finish area and at Lake Marie Aid Station only; crew are not allowed at Napa Road or Soscol Headwaters aid stations. Pacers are permitted for solo 50 mile runners after the first loop and must carry their own nutrition.
Entry fees are non-refundable and non-transferable; race credit options are available on a sliding scale depending on notice. Photos will be available to view at no charge with optional purchases for high-resolution images. Visit the organization's website for the most recent information.
