Quicksilver Endurance Runs

Quicksilver Endurance Runs - May 9, 2026

Join us for the 41st edition of the Quicksilver Endurance Runs and the twelfth edition of the 100k. The 50K and 100K races are run on scenic, hilly single track trails and fire roads. You will run through peaceful oak forests, wide-open meadows, and along ridges with spectacular views of the Santa Clara Valley and the Santa Cruz Mountains. Although the course is very challenging, the friendly aid stations and beautiful scenery make Quicksilver an excellent choice for a first trail ultra-marathon.

50% of the race proceeds go to non-profits that help kids stay healthy or fund trail advocacy projects.

About each event

The 100K:

• Start Time: 4:30am
• ~13,000+ feet of elevation gain
• Western States 100 qualifying race, 17-hour time limit and all official finishers qualify for the Western States 100 PA/USATF Ultra Grand Prix Event

The 50K:

• Start Time: 7:00am
• ~6,000+ feet of elevation gain
• 4:00pm cutoff at mile 22.

Registration closes: Sat, May 2 @ 11:59PM PT

Location: Hacienda Entrance of the Almaden Quicksilver County Park (21785 Almaden Road, San Jose, CA 95120)