Trail Running calendar near Clayton 2025-2026

The Quicksilver Trail Challenge, hosted by the Quicksilver Running Club in San Jose, California, is an annual trail running event held in late summer or early fall at Almaden Quicksilver County Park. It features a half marathon, a 10K race, and a free one-mile kids' fun run. The courses traverse sce..

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 ZombieRunner Halloween race takes place at Hellyer County Park in San Jose, California. Scheduled for November 1, 2025, it offers multiple distances including 5K, 10K, Half Marathon, Marathon, and age-specific 5K and 10K events, plus a free Kid's Run for children six and under. The courses are m..

The Rio Del Lago 100 Mile Endurance Run will take place in Granite Bay on Saturday 1 November 2025. You can run between 31 and 100 miles.

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk takes place at Joaquin Miller Park Meadow in Oakland, California. This event features a 5K trail run and a 1-mile fun run/walk, offering participants scenic views with towering trees and a course that is both enjoyable for casual runners a..

The NorCal Backyard Ultra, held at Beals Point in Granite Bay, CA, is a challenging endurance running event featuring a 4.2-mile loop course along scenic singletrack trails and lakefront views at Folsom Lake. The main event, Last Person Standing, requires runners to complete a loop every hour until..

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

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..

The Mermaid Trail Run - Woodside will take place in Woodside on Saturday 8 November 2025. You can run between 3 and 6 kilometers.

The Ripon Turkey Trail Run will take place in Ripon on Saturday 15 November 2025. You can run between 5 and 13 miles.

The Falcon Crest Winter Trail Challenge is a scenic trail running event held in the foothills of El Dorado Hills, California, near Folsom Lake. The race offers multiple distances including 5K, 10K, 15K, half marathon, 30K, and a trail marathon. The course features mostly single-track dirt and rocky..

The Golden Gate Trail Classic will take place in San Francisco from Saturday 22 November 2025 to Sunday 23 November 2025. You can run between 15 and 50 miles.

The Darrington Single Track Trail Challenge is a trail running event held in Pilot Hill, California, near Folsom Lake. It offers multiple race distances including a 36-mile, 18-mile, 10K, and 5K, catering to various skill levels. The course features stony dirt paths that traverse relentless hills, p..

The Zoom Turkey Trot is a Thanksgiving Day running event held at Hellyer County Park in San Jose, California. It offers multiple race distances including 5K, 10K, and a USATF-certified half marathon, with additional age-specific categories and a free 50-yard dash for kids six and under. The courses..

The Quad Dipsea is a challenging 28.4-mile trail race held in Mill Valley, California, featuring approximately 9,000 feet of vertical gain. The course starts at Old Mill Park and includes steep stairs, rugged hills, and scenic sections such as Muir Woods, Dynamite, The Hogsback, Cardiac Hill, Steep..

The Quarry Turkey Half Marathon is a family-friendly Thanksgiving weekend running event held at Quarry Lakes Regional Park in Fremont. The race offers a half marathon, 10K, and 5K distances, all featuring fast, mostly-flat courses on beautiful trails. A special free "Little Turkeys" sprint of about..

The Krampus Cross Country is a festive running event held in San Francisco, California, featuring live and virtual options. Participants can choose from three distances: a 5K, 10K, or the challenging Naughty Nine Miler. The live races start at the Ecology Trail Head at the end of Barnard Avenue, wit..

The Peacock Gap Trail Run, hosted by Inside Trail Racing, takes place at China Camp State Park in San Rafael, California. This scenic event offers three distances: 10K, half marathon, and 30K, featuring twisting single-track trails with views of Mt. Tam, San Pablo Bay, and San Francisco Bay.The cour..

The Calero Trail Run - Winter is a versatile trail running event held at Calero County Park in San Jose, California. It offers a range of distances including a 50K, trail marathon, 25K, half marathon, 15K, 10K, 5K, mile, and a kids run, catering to all levels of runners. The course features scenic s..