Summit Rock Half Marathon
Redwood singletrack above Silicon Valley, this December trail half climbs to the top of Sanborn County Park and rewards runners who walk the steep parts.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 28, 2026.
Quick facts
- Genuine mountain trail half with a long climb to the top of Sanborn County Park.
- Mixed surface of fire road, technical singletrack and short paved connectors.
- Small fields, roughly 110 to 150 half marathon finishers.
- Suited to runners comfortable hiking climbs rather than chasing a flat time.
2026 Summit Rock Half Marathon registration
Registration for the 2026 Summit Rock Half Marathon runs through the official registration page at runsignup.com.
About the Summit Rock Half Marathon
One of Brazen Racing's toughest halves, held in the Santa Cruz Mountains a short drive from San Jose. Fields hover near 110 to 150 finishers, and the organizers openly tell first time trail runners to hike the climbs rather than race them.
Course
A mix of fire road, tight singletrack and short paved sections through Sanborn County Park's redwood groves, with a sustained climb to the park's high point and views over the valley. The descents are technical enough that downhill running skill matters as much as fitness.
Race-day weather
Mid December in the Santa Cruz Mountains is cool and often damp, with filtered light under the canopy and temperatures in the 40s and 50s. Recent rain leaves roots and clay slick on the steeper singletrack.
Past Summit Rock Half Marathon dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Saturday, December 12, 2026 | Upcoming | — |
Summit Rock Half Marathon FAQ
When is the Summit Rock Half Marathon?
The 2026 Summit Rock Half Marathon is on Saturday, December 12, 2026.
How do I register for the Summit Rock Half Marathon?
Register for the Summit Rock Half Marathon through the official registration link: marathonscout.com/go/summit-rock-half-marathon/register. It opens the race registration page at runsignup.com.
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