30 miles of mining history through Silicon Valley's best trail park

No Service Requirement

Does not require trail or volunteer work

No qualifier race required

Some ultra experience recommended

The Quicksilver Endurance Runs 50K is a 30.3-mile loop through Almaden Quicksilver County Park, sharing the first and final sections of course with the 100K sibling race. Starting at 7am from the Hacienda entrance, runners climb 6,000+ feet through historic mercury mining trails — past the old rotary furnace at English Camp and through the New Almaden Trail's finest singletrack — before looping back to the finish. With a single intermediate cutoff at McAbee Aid Station (mile 22), the course is accessible to trail runners building up to longer distances while still offering a true challenge.

Passes the historic rotary furnace and mining relics from California's largest 19th-century quicksilver mine

Challenging elevation profile through the Almaden and Sierra Azul foothills, with views of Silicon Valley and Mt. Hamilton

Run alongside the 100K as part of one of the Bay Area's oldest and most beloved trail race events

This event uses open registration - no lottery entry required.

This event does not require a qualifier for entry.

This race does not have a service requirement for entry.

No Service Requirement

Does not require trail or volunteer work

No qualifier race required

Some ultra experience recommended

Passes the historic rotary furnace and mining relics from California's largest 19th-century quicksilver mine

Challenging elevation profile through the Almaden and Sierra Azul foothills, with views of Silicon Valley and Mt. Hamilton

Run alongside the 100K as part of one of the Bay Area's oldest and most beloved trail race events

This event uses open registration - no lottery entry required.

This event does not require a qualifier for entry.

This race does not have a service requirement for entry.

Location	Mile	Elevation
Start - Hacienda Start	0.0	482 ft
Hicks Road - 1 Aid Station	6.1	1,434 ft
Hacienda Aid Station	9.7	482 ft
Mockingbird Aid Station	12.8	518 ft
Bull Run - 1 Aid Station	16.7	1,552 ft
McAbee Aid Station	22.4	384 ft
Bull Run - 2 Aid Station	27.3	1,552 ft
Finish - Hacienda Finish	30.3	482 ft

Location	Mile	Elevation
Start - Hacienda Start	0.0	482 ft
Hicks Road - 1 Aid Station	6.1	1,434 ft
Hacienda Aid Station	9.7	482 ft
Mockingbird Aid Station	12.8	518 ft
Bull Run - 1 Aid Station	16.7	1,552 ft
McAbee Aid Station	22.4	384 ft
Bull Run - 2 Aid Station	27.3	1,552 ft
Finish - Hacienda Finish	30.3	482 ft

Quicksilver Endurance Runs 50K

Nearby races

Quicksilver Endurance Runs 100K

Miwok 100K

Muir Woods Mountain Challenge 30K

The Big Alta 100K

Rio Del Lago 100 Mile

Lake Sonoma 100K

Canyons 100 Mile

Mammoth Bar Half Marathon

Quicksilver Endurance Runs 50K

What Makes It Great

Difficulty

Race Highlights

Finish Awards