Trail Running calendar near Mill Valley 2025-2026

The Tamalpa Headlands 50K is a challenging ultramarathon held annually in Marin County, California, starting and finishing at Santos Meadow near Muir Woods. Covering a 50-kilometer single-loop course, it features approximately 6,500 feet of elevation gain across iconic trails such as Coastal, Miwok,..

The Almaden Hills Trail Run - Summer is a challenging trail running event held at Almaden Quicksilver Park in the scenic Almaden Valley, San Jose, California. The course features a mix of 60% dirt roads and 40% single-track trails with significant hills, offering runners beautiful countryside views...

The Envirosports Angel Island Half Marathon & 10K is an annual race held at Angel Island State Park near Tiburon, California. The event features a scenic, hilly loop trail that circumnavigates Angel Island, offering stunning panoramic views of the Golden Gate Bridge, San Francisco, Alcatraz Island,..

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

The Santa Cruz Trail Run, hosted by Inside Trail Racing, takes place at Henry Cowell Redwoods State Park in Felton, California. This scenic event offers three distances: 10K, Half Marathon, and 30K, featuring challenging courses through giant redwoods, twisting single-track trails, fire roads, and a..

Run-de-Vous is a multi-distance running event held at Harvey Bear Ranch Park in San Martin, California. Scheduled for August 29, 2025, it offers a variety of race options including a marathon, 50K, 50-mile, 100K, 100-mile, and a 4-person 50-mile relay. The course is a fast 2-mile loop set against sc..

The SPASM Crystal Springs Trail Run is an exciting running event taking place in Huddart Park, Woodside, CA. Scheduled for August 31, 2025, it features multiple race distances including an 8K, Half Marathon, 35K, Marathon, and 50K, along with a free Kid's Run for children aged 6 and under. Participa..

The Stevens Creek Striders Reservoir Run, held in Cupertino, CA, offers a scenic trail running experience with distances of a half marathon (13.2 miles), 11K, and a 2.5-mile Lollipop Loop charity run/walk. The course features shaded single-track trails and open vistas, including challenging steep as..

The Diablo Trail Run, held at Diablo State Park in Clayton, California, offers a variety of trail running events including 4-mile, 10-mile, half marathon, marathon, 50K, and a free kids' 50-yard dash for children six and under. The courses feature scenic mountainous terrain with spectacular views of..

The South Hills Single Track Trail Run - Summer, held at Calero County Park in San Jose, CA, offers a variety of distances including 50K, trail marathon, 16-mile, half marathon, 9-mile, 10K, 5K, mile, and a kids run. The course features challenging single track trails, hills, dirt paths, oak trees,..

The Berkeley Trail Adventure is a scenic trail running event held in Berkeley, California, within Tilden Regional Park and Wildcat Canyon. It offers four race distances: 10K, half marathon, 35K, and 50K, catering to runners of all levels, including first-time trail runners. The courses feature a mix..

The Mt. Umunhum Marathon, Race to the Top and Down, is a challenging trail marathon held in Almaden Quicksilver County Park, San Jose, California. The race begins at the Hacienda Entrance and ascends to the summit of Mt.Umunhum, offering runners a demanding climb followed by a thrilling descent back..

The Rocky Ridge Trail Half Marathon is a challenging trail race held in the scenic Las Trampas Wilderness near San Ramon, California. Scheduled for September 20, 2025, the event features a half marathon, 10K, and 5K distances. Known for its tough terrain and significant elevation changes, the half m..

The Dick Collins Firetrails will take place in Castro Valley from Saturday 27 September 2025 to Sunday 28 September 2025. You can run between 42 and 100 kilometers.

The Pacifica Summit Run is a scenic trail running event held at San Pedro Valley State Park in Pacifica, California. It offers two race distances: a 10K and a half marathon. Runners experience challenging switchbacks and enjoy stunning postcard views of the Pacific Ocean coastline from the tallest m..

The Spartan Trail - San Jose Trail Challenge takes place at Sanborn County Park in Saratoga, California, nestled on the eastern slopes of the Santa Cruz Mountains. This scenic event offers three race distances: 10K, 21K (half marathon), and 50K, featuring well-groomed but steep and challenging trail..

The Trailblazer Race in Mountain View, CA, is an annual family-friendly event featuring 10K and 5K runs, plus a 3-mile walk along the scenic Stevens Creek Trail and Shoreline Park. The courses are fast, flat, and stroller-friendly, offering beautiful views of wildlife, salt ponds, and surrounding mo..

The Star City San Bruno Mountain Half Marathon & 5K, held in Brisbane, California, offers a scenic trail running experience with spectacular views of the Pacific Ocean, San Francisco Bay, and the city skyline. The half marathon course is 93% trail, featuring 2,400 feet of elevation gain and a thrill..

The Reservoir Dogs Trail Run in Orinda, CA, offers 10K, Half Marathon, and 35K distances around the scenic Briones Reservoir on East Bay Municipal Utility District (EBMUD) trails. This event features a mix of rolling fire roads, tree-covered single-track, and expansive views of watershed lands, prov..

The SFRC Women's Headlands Half Marathon is a scenic trail running event held in the Marin Headlands, starting and finishing at Rodeo Beach near Sausalito, California. The race features a challenging 12.6-mile half marathon with 2,494 feet of elevation gain, alongside a 6-mile 10K option. Both cours..