Quicksilver Trail Challenge

OCT
17
2026
Trail races at Almaden Quicksilver County Park offering a half marathon, 10K and kids 1 mile with historic mining views and local conservation support.
Sat 17 Oct 2026
Half Marathon 10 kilometers

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Quicksilver Trail Challenge

The Quicksilver Trail Challenge is an annual trail running event organized by the Quicksilver Running Club of San Jose. It takes place in late summer or early fall at Almaden Quicksilver County Park in San Jose, California and includes multiple distances on trails shared with the Quicksilver 50k/100k ultramarathon events.

Race distances:

  • Half marathon
  • 10K
  • Kids 1 mile fun run

The course passes historic mining landmarks and offers views of Mt. Umunhum and the Santa Cruz Mountains. Aid stations are located at named points on the courses, including Capehorn Pass and Prospect, with multiple stations on the half marathon. The half marathon and 10K use the same courses as recent years.

Entry fees are published and vary by event and registration date; the kids race is free with day-of-race signup available. Awards are given to the top three finishers in each gender and age group; all finishers receive a finisher award and participants in the kids race receive medals. Typical total registration is around 150 runners.

The club donates a portion of race proceeds to local conservation and youth organizations and contributes volunteer hours to trail maintenance. Volunteers staff aid stations and start/finish areas with a range of roles and flexible hours. Weather can range from cool to warm and the course has natural hazards such as poison oak, rattlesnakes, and ticks. Visit the organization's website for the most recent information.

Half Marathon
Half Marathon
10 km
10k
Kids 1 Mile Race
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