Trail Running calendar near Gilroy 2025-2026

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 Big Sur Trail Marathon, Half Marathon, and 5 Mile race take place annually at Andrew Molera State Park in Big Sur, California. Now in its 35th year, this event offers challenging courses along the scenic Old Coast Road, featuring stunning views of the California coastline and hilly terrain. The..

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 a scenic trail running experience around the Briones Reservoir on EBMUD trails, typically permit-only. Scheduled for October 4, 2025, the event features three distances: 10K, Half Marathon, and 35K, all starting and finishing at the San Pablo Reserv..

Run by the Sea is an annual running event held at Wilder Ranch State Park in Santa Cruz, California. Scheduled for October 5, 2025, the race offers three distances: a 4K run/walk, a 12K run, and a half marathon. The courses primarily feature flat, packed dirt trails that wind along the scenic coasta..

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 on paved paths and groomed dirt shoulders around the lake, with about 100 feet of elevation gain per..

The Mt. Umunhum Trail Conquest-Fall is a trail running event held at Almaden Quicksilver County Park in San Jose, California. The race offers multiple distances including a 5K, 7 Mile, Half Marathon, 30K, Trail Marathon, and a challenging 50K.The longer courses venture into the scenic Sierra Azul Op..

The Diablo Summit Stomp is a trail running event held in Walnut Creek, California, featuring distances of 30K, half marathon, 10K, and 5K. The courses traverse dirt trails starting from Castle Rock Park and extend into Mount Diablo State Park, with the 30K reaching the summit of Mount Diablo. The ev..

The Quicksilver Trail Challenge, held in Almaden Quicksilver County Park near San Jose, CA, offers a Half Marathon, 10K, and a free one-mile Kids Race. Set on scenic single-track trails and fire roads through historic mining territory, runners experience peaceful oak forests, open meadows, and stunn..

The Haunted Hills 10K in Redwood City is a unique nighttime running event featuring a spooky, festive atmosphere. Participants run through wickedly decorated neighborhoods, navigating approximately 36 checkpoints along the 10K course. Runners, in teams of one to five, engage in a fun challenge by an..

The Oakland Hills Trail Run, held at Redwood Regional Park in Oakland, CA, offers challenging trail races in three distances: 10K, half marathon, and 35K ultramarathon. Set in a serene redwood forest with towering 150-foot coast redwoods, the course features technical dirt trails and fire roads with..

The ZombieRunner Halloween is a festive running event held at Hellyer County Park in San Jose, California. Scheduled for November 1, 2025, it offers multiple race distances including 5K, 10K, Half Marathon, Marathon, and various youth categories, plus a free Kid's Run for children six and under. The..

The Almaden Hills Trail Run - Fall takes place in Almaden Quicksilver Park, located in the scenic Almaden Valley near San Jose, CA. The event offers a variety of distances including 50K, trail marathon, 30K, half marathon, 10K, 8-mile, and 5K races. The course features a challenging mix of terrain,..

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk is set to take place at Joaquin Miller Park, supporting the Oakland Tech Cross Country and Track Team. This event features a scenic 5K trail run and a 1-mile fun run/walk, designed to cater to both competitive runners and leisurely partici..

The Lake Chabot Trail Run, held in Castro Valley, California, offers a variety of distances including 8K, Half Marathon, 30K, Marathon, 50K, and a free Kid's Run for children six and under. The course begins at the Lake Chabot Regional Park Marina and loops around the scenic Lake Chabot reservoir an..

The Rancho Hills Trail Run - Fall is a challenging trail running event held at the Rancho Cañada del Oro Open Space Preserve in Morgan Hill, California. The race offers a variety of distances ranging from 5K to 50K, including 8-mile, 10-mile, half marathon, 30K, and trail marathon options. The cours..