Trail Running calendar near Waterford 2026-2027

A two day Spartan obstacle race weekend at Modesto Reservoir Regional Park offering Sprint, Super, Beast and Ultra distances plus a kids race and spectator access.

A trail running event in Walnut Creek on April 3, 2027 offering 50K, half marathon, 10K, 5K and a remote option. Part of entry fees support Save Mount Diablo and its land conservation work.

A trail event at Lake Chabot Regional Park offering distances from a 50‑yard kids dash to a 50K ultramarathon. The looped course circles the Lake Chabot reservoir and surrounding hills with measured distances.

A 5K mud and obstacle run at Mahon Ranch in Elk Grove on May 16, 2027, with adult and KIDZ family waves, required signed waivers and photo ID for adults, spectator festival access, and on-site event photography.

Run for Amma is a charity trail event at Skyline Ridge Open Space Preserve in Los Gatos offering 50K, 30K and 10K courses, with all registration proceeds donated to a UCSF cancer research lab.

Trail runs of 31.1 miles and 12.4 miles through Sierra National Forest, with spaced aid stations, onsite pre-race lodging and dinner, and no pets on course or campus.