Trail Running calendar near Windsor 2025-2026

The Running Dead 5K Fun Run in Union City, California, is a Halloween-themed community race at Civic Center/City Hall (34009 Alvarado-Niles Road). It offers a 5K open to adults and a 5K Youth option for younger runners. The course follows the Alameda Creek Trail from City Hall and returns to the fin..

Oakland Hills Trail Run takes place in Redwood Regional Park, Oakland, CA, offering 35K, half marathon, and 10K distances through a coastal redwood forest and surrounding foothill habitat. The course comprises mostly technical dirt trails and non-technical fire roads with significant elevation gain..

2025 Napa Fall Wine Country Marathon, Half Marathon & 10K takes place in Bothe-Napa Valley State Park along Saint Helena Highway in Saint Helena, CA. The course uses lush single-track trails with hills, streams and rocky sections, delivering a rugged and rewarding challenge, set just minutes from Na..

The 27th Annual Matt Yeo Memorial Aggie XC Open, presented by the HOKA Aggies, is held at Radke Martinez Regional Shoreline in Martinez, California. The meet features three 4.1-mile cross-country races for Women, Masters Men, and Open Men, all run on a course with grass, dirt, and path footing. The..

The 39th Golden Gate Park XC Open, held at Lindley Meadow (30th Ave & JFK Dr) in San Francisco's Golden Gate Park, is a 5k cross-country race over grass, dirt, and rolling hills. It features Masters Women 40+ and Masters Men 40+ along with Open Women and Open Men, and serves as the USATF Masters 5k..

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..

Lake Chabot Trail Run is a multi-distance trail race held at Lake Chabot Regional Park – Marina in Castro Valley, CA. The event offers 8K, Half Marathon, 30K, Marathon, 50K, and a Kids Run, inviting runners of varied backgrounds. The course starts at the Marina and loops around the Lake Chabot reser..

Mt. Tam Trail Run, staged by Inside Trail Racing, starts in Stinson Beach, California, at Mt. Tamalpais State Park.Runners tackle four distances—50K, 30K, half marathon, and 10K—on technical dirt trails and non-technical fire roads with steep climbs and stunning coastal views. Elevation gain ranges..

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.

Quad Dipsea is an ultramarathon held in Mill Valley, California, starting at Old Mill Park. The event features four grueling laps along the Dipsea Trail to Stinson Beach and back, totaling roughly 28 miles with about 9,000 feet of elevation gain. Runners confront famous climbs and rugged terrain, in..

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..

Peacock Gap Trail Run, part of Inside Trail Racing, takes place at China Camp State Park in San Rafael, CA. The event offers three distances: 10K, Half Marathon, and 30K. Runners traverse twisting single-track through forested sections and open trails along the San Pablo Bay side, with sweeping view..

Hunter S. Thompson Fear & Loathing in San Francisco is an urban ultramarathon offering 50K or 50 miles. Located in San Francisco, the single-loop course starts and finishes atop Twin Peaks, with the city spread out beneath.The 50K route is about 99% city streets; the 50-mile option includes some tra..

2025 Hark the Herald Half Marathon & 10K, the 37th annual edition, takes place at Angel Island State Park, Belvedere Tiburon, California. The Half Marathon is two loops on a hilly trail; the 10K is a single loop. The event is limited to 400 participants, creating an intimate atmosphere with panorami..

Brazen Racing’s Almost New Year’s Eve is a trail-running event at Lake Chabot in Castro Valley, California. Runners may choose from a Half Marathon, 10K, or 5K, with hikers and walkers welcome. The race navigates Lake Chabot’s scenic trails, delivering a festive, outdoor atmosphere as participants c..

Brazen New Year's Day is an annual running event held at Lake Chabot in Castro Valley, California. It offers a scenic and challenging course with three distance options: a half marathon, 10K, and 5K. The race takes place on January 1st, providing a festive and invigorating way to start the new year...

Pacifica Foothills Trail Run takes place at San Pedro Valley Park, Pacifica, CA. Runners choose among 10K, half marathon, and 30K, all on dirt trails atop Mt. Montara and surrounding foothills.The course is mostly technical single-track with significant elevation gain (approximately 1,200 ft for the..

Bay Breeze in 2026 offers a scenic bayside challenge in San Leandro, starting and finishing at San Leandro Marina Park (14001 Monarch Bay Dr). The event features three distances: 5K, 10K, and a Half Marathon. Runners enjoy a mostly-flat, easy bayside course that stays close to the water, with romant..

Redtail Ridge at Lake Chabot Regional Park in Castro Valley, CA offers multiple distances: 5K, 10K, Half Marathon, 30K, and 50K. The course unfolds on a mix of moderately technical dirt trails and non-technical fire roads, with some paved sections, and features rolling hills that reward pacing and t..

Montara Mountain Trail Run takes place at San Pedro Valley Park in Pacifica, California. The event offers 10K, Half Marathon, 20 miles, Marathon, 50K, and a Kid’s Run, weaving through the area’s undisturbed Coastal Mountain Habitat with ocean views. Elevation gains range from about 1,200 feet (10K)..