Riley Park Trail Races
Coto de Caza, United States • 1 Aug 2026
Riley Park Trail Races : Thomas F. Riley Wilderness Park
Riley Park Trail Races is a looped trail event held in Thomas F. Riley Wilderness Park in Coto de Caza, Orange County, California. The course is a single loop of approximately 3.3 miles that uses single track and double track terrain.
Available distances:
- 5k - 1 loop
- 10k - 2 loops
- 10 Miler - 3 loops
- Half Marathon - 4 loops
- 30k - 6 loops, 6.5 hour finish cutoff
- 6 Hour event - as many loops as a runner completes within six hours
Registration opens on February 1, 2026. Athlete guides and detailed course information are provided for the 5k and 10k fields and for the longer distances. Bib pickup is scheduled on the days before the race at local running stores in Costa Mesa and Laguna Niguel, with additional pickup available on race morning; specific pickup times and locations are listed in the race guide. The event lists participant items, including a race shirt and a finisher medal for every finisher.
The description focuses on course format, available distances, registration timing, bib pickup arrangements, and finisher items. Participants are advised to consult the athlete guide for arrival, parking, and course details. Visit the organization's website for the most recent information.