Trail Running calendar near Lake Sonoma 2025-2026

The Dirty Dozen Run is an annual trail running event held at Point Pinole Regional Shoreline in Richmond, California. It features 12-hour, 6-hour, and 3-hour endurance races on a scenic 3.37-mile loop composed mostly of dirt fire trails. The course offers expansive shoreline views, including multipl..

The Muir Woods Mountain Challenge, held in Mt. Tamalpais State Park near Stinson Beach, CA, offers trail runs of 10K, half marathon, and 30K distances. The course features a challenging 2,000-foot climb early on, scenic ridge-line views of Stinson Beach and the Pacific Ocean, and technical single-tr..

The Rodeo Valley Trail Run, held in the scenic Marin Headlands near Sausalito, California, offers trail races of 8K, Half Marathon, 30K, and 50K distances. Starting near historic Fort Cronkhite and Rodeo Beach, the course features challenging steep climbs and descents along coastal trails with stunn..

The Tamalpa Headlands 50K is a challenging ultramarathon held in Sausalito, California, featuring a single-loop course through Marin County's iconic trails such as Coastal, Miwok, Steep Ravine, Matt Davis, and Dipsea. The race covers 50 kilometers with approximately 6,500 feet of elevation gain, com..

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

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..

The Mendocino Running Festival takes place in Mendocino Woodlands Park, California, a National Historic Landmark known for its ancient redwood forest setting. The event features a looped trail course of 6 miles with 875 feet of elevation gain, including single-track trails, log bridge crossings, and..

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, featuring technical dirt trails, fire roads, and some asphalt sections. The course showcases sha..

The Celebration of Life - Trail Trek is a trail running event held in Willits, California, at the Brooktrails Par Course. Scheduled for September 27, 2025, it offers multiple distances including a 5K-ish Trail Run/Walk, a half marathon, and Par Course loops. The course features a mix of maintained s..

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..

The Reservoir Dogs Trail Run in Orinda, CA, is a scenic trail running event held on October 4, 2025, featuring 10K, Half Marathon, and 35K distances. It uniquely circumnavigates the Briones Reservoir on EBMUD trails, offering a mix of rolling hills, tree-covered single-track, and open fire roads wit..

The Tails & Trails Charitable Walk/Run takes place in Windsor, California, at 11010 Estate Lane. This event features two race options: a 5K run and the Dogwood Dash. It is organized to support charitable causes, creating a community-focused and friendly atmosphere.While specific details about the co..

Go Wild Marin 4 Hr is an adventurous trail and wilderness scramble held on the Tiburon Peninsula in Corte Madera, California. Participants compete individually or in teams of up to five, using a custom map to locate as many as 24 checkpoints scattered across trails and wild areas within a four-hour..

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..

The Napa Lapa Trail Adventure, hosted by Inside Trail Racing, is a unique time-based trail running event held at Skyline Wilderness Park in Napa, California. Instead of racing a fixed distance, participants run as far as possible within 3, 6, or 12-hour time limits on a challenging 4.16-mile loop fe..

The John Lawson Tamalpa Challenge is a cross-country running event held annually at China Camp State Park in San Rafael, California. The 2025 edition features three races, each approximately 4.2 miles long, primarily on rolling single-track trails with a short stretch on asphalt. The event honors Jo..

The Lake Sonoma 100K and 55K, also known as the California Fall Classic, is a challenging ultramarathon held at Lake Sonoma, California, set amidst the scenic wine country during harvest season. The event features two distances—100 kilometers and 55 kilometers—on demanding courses that traverse mile..

The California Fall Classic at Lake Sonoma is a challenging ultramarathon event held in Healdsburg, California, featuring two distances: 100K and 55K. Set amidst the scenic wine country during harvest season, the courses offer relentless single-track trails with stunning views of Lake Sonoma. The 10..

The Napa Fall Wine Country Marathon is an annual trail running event held at Bothe-Napa Valley State Park in Saint Helena, California. Celebrating its 33rd year, the race offers marathon, half marathon, and 10K distances. The course features lush single-track trails with hills, streams, and rocky te..

The Mt. Tam Trail Run, held at Stinson Beach, California, offers challenging trail races of 10K, half marathon, 30K, and 50K distances. The course features a demanding climb up Mount Tamalpais with stunning views, followed by scenic trails through the Headlands, finishing back at the beach.The terra..