Quicksilver Endurance Runs
San Jose, United States • 9 May 2026
Quicksilver Endurance Runs : May 9, 2026
The Quicksilver Endurance Runs are trail races held at the Hacienda Entrance of Almaden Quicksilver County Park (21785 Almaden Road, San Jose, CA). The event features hilly single-track trails and fire roads that pass through oak forests, meadows, and ridgelines with views of the Santa Clara Valley and the Santa Cruz Mountains.
Distances include:
- 100K: ~13,000+ ft elevation gain. 17-hour time limit. Western States qualifier.
- 50K: ~6,000+ ft elevation gain. Cutoff at mile 22.
This is the 41st edition of the event and the twelfth edition of the 100K. The 100K is a Western States 100 qualifying race and is listed as a PA/USATF Ultra Grand Prix event. About half of race proceeds are directed to non-profit organizations that support youth health programs or trail advocacy.
Logistics noted by the organizer include fully stocked aid stations, more than 100 volunteers, and post-race food at the finish. Registration closes May 2 at 11:59 PM PT. A waitlist is available when distances are full; canceled entries may receive a 50% rollover of the registration fee prior to February 9, 2026. On or after February 9, 2026 there is no refund or credit of entry fees. Visit the organization's website for the most recent information.