San Francisco 50Mi/50K Endurance Run

Explore Tiburon Peninsula trails at Go Wild! Marin in Corte Madera on October 11. Pick a 2 Hr or 4 Hr solo or team map run to find up to 24 checkpoints, then relax with refreshments and socializing.

Join the Ruth Anderson Memorial Endurance Run in San Francisco on October 11, 2025 for challenging looped ultramarathon distances. Choose from 100 km, 50 miles or 50 km on scenic Lake Merced loops with aid each circuit and chip timing.

Event overview The event is three cross-country races held at Miwok Meadows in China Camp State Park, San Rafael, CA. The races are run as a memorial to a Tamalpa Runner who died in 2000. Each race uses the same course as in 2024 and is rou..

Run scenic trails from Castle Rock Park into Mount Diablo State Park in Walnut Creek on October 18, 2025 with 5K, 10K, half marathon and summit 30K options. Expect dirt paths, creek crossings and panoramic summit views for all paces.

The 27th Annual Matt Yeo Memorial Aggie XC Open, presented by the HOKA Aggies, is held at Radke Martinez Regional Shoreline in Martinez, California. The meet features three 4.1-mile cross-country races for Women, Masters Men, and Open Men,..

Event overview The Haunted Hills 5K & 10K is a Halloween-themed walking and running event in Redwood City, CA, on October 25, 2025. It is organized as a trick-or-treat style course for adults and families. Participants form teams of 1 t..