Logo

Ruth Anderson Memorial Endurance Run

Lakeshore, United States • 11 Oct 2025

The Ruth Anderson Memorial Endurance Run is an ultradistance race held annually in San Francisco, California, at scenic Lake Merced. The course features a mostly flat, USATF-certified 4.48-mile loop around the lake, combining asphalt paths and groomed dirt shoulders with about 100 feet of elevation gain per loop. Runners can choose to compete in 50 kilometers or 50 miles, with aid stations stocked with water, electrolytes, and food available each loop.

The race headquarters at Lake Merced Blvd. and Sunset Blvd. serves as the start, finish, and aid station hub.

The event offers a supportive atmosphere with generous cutoffs and commemorative patches for finishers. Visit the organization's website for the most recent information.

United States California Lakeshore

Race information

Website Registration
50 mi
50 Miles
50 km
50 Kilometers
Visit the organization's website for the most recent information.
Trail runs nearby

Bear Creek Run

Lafayette - 23 mi from Lakeshore

Bear Creek is a trail running event held in Lafayette, California, featuring a half marathon, 10K, and 5K distances. The race takes place on August 9, 2025, at 1611 Bear Creek Road within Briones Regional Park. Unlike flat courses, Bear Creek offers a challenging route with many hills, rewarding par..

Tamalpa Headlands 50K

Mill Valley - 12 mi from Lakeshore

The Tamalpa Headlands 50K is a challenging ultramarathon held annually in Marin County, California, starting and finishing at Santos Meadow near Muir Woods. Covering 50 kilometers with about 6,500 feet of elevation gain, the single-loop course features renowned trails such as Coastal, Miwok, Steep R..

Redwood (Summer) Trail Run

Oakland - 13 mi from Lakeshore

...

The Redwood (Summer) Trail Run, held in Oakland, California, offers a scenic race experience through Redwood Regional Park. Participants can choose from multiple distances including 5 miles, half marathon, 30K, marathon, 50K, and a free kids' 50-yard dash for children six and under. The course featu..

Envirosports - Angel Island Half Marathon

Belvedere Tiburon - 10 mi from Lakeshore

The Envirosports - Angel Island Half Marathon will take place in Belvedere Tiburon on Saturday 23 August 2025. You can run between 10 and 13 miles.

Double Dipsea

Stinson Beach - 14 mi from Lakeshore

The Double Dipsea is a challenging 13.7-mile trail race held annually at Stinson Beach, California, celebrating its 55th running in 2025. The course follows the legendary Dipsea Trail from Stinson Beach to Mill Valley and back, featuring steep hills, numerous stairs, and stunning views. Unique to th..

Crystal Springs Trail Run

Woodside - 25 mi from Lakeshore

...

The SPASM Crystal Springs Trail Run takes place in Woodside, California, at Huddart Park, offering runners a scenic experience through towering redwoods, lush ferns, and trails in Huddart Park, King's Mountain, and Bear Gulch. The event features multiple distances: 8K, Half Marathon, 35K, Marathon,..