Summit Rock Half Marathon, 10K & 5K
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Summit Rock Half Marathon, 10K & 5K
The event takes place on December 12, 2026, at Sanborn Regional Park in the Santa Cruz Mountains, just outside Silicon Valley. Races run on single-track trails beneath redwood groves and on park trails with varied terrain.
Distances offered:
- Half marathon, part of the Brazen Ultra Half Series
- 10K
- 5K
The half marathon and the 10K include uphill sections that reach park peaks with views. All distances use single-track trail segments and include sections that favor walking on steeper climbs. Electronic chip timing is used for all races, and every finisher receives a custom finisher medal. Walkers and hikers are explicitly welcome to participate.
Event operations note that races are professionally timed and that volunteer photographers provide free event photos. The half marathon is included in a series of "ultra half" races characterized by longer distances and significant ascents and descents, which the organizer describes as part of a tougher series of trail half marathons. Visit the organization's website for the most recent information.
