Trail Running calendar near San Leandro 2025-2026

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 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..

Peacock Gap Trail Run, hosted by Inside Trail Racing, takes place at China Camp State Park in San Rafael, CA. The event offers 30K, Half Marathon, and 10K distances, with a field cap of about 275 runners. Runners traverse twisting single-track trails and non-technical fire roads through forested hil..

ZombieRunner Quarry Lakes takes place on Saturday, December 6, 2025, in Fremont, CA at Quarry Lakes Regional Recreation Area (Ensenada Pavilion). The event includes multiple distance options: 5K 10K Half Marathon 30K Marathon 5K (12 yo & under) 5K (13 - 17 yo) 10K (12 yo & under) 10K (13 -..

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..

Summit Rock is Brazen Racing’s trail event held in the redwood and pine forests of Sanborn County Park, just outside Silicon Valley in Saratoga, California. Runners can choose from a 5K, 10K, or half-marathon, all on miles of single-track trails through the Santa Cruz Mountains. The course features..

Woodside Ramble, held at Huddart County Park in Woodside, CA, offers 10K, half marathon, 35K, and 50K trail races through Huddart and Wunderlich Parks along redwood-canopy trails, including Crystal Springs and Skyline Trails, with streams, canyons, and sweeping ridgeline views. The course features m..

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 2026 takes place at Lake Chabot in Castro Valley, California. Runners can choose from a half marathon, 10K, or 5K on Lake Chabot’s scenic trails. The course loops around the lake and is described as scenic and invigorating, offering a family-friendly atmosphere as participants..

The Hacienda Hills Trail Run - Winter is a trail running event held at Almaden Quicksilver County Park near San Jose, California. It offers nine race distances ranging from a Kids Run and 1 Mile to challenging 50K and Marathon options, all featuring increasing elevation gain through scenic Northern..

Hope in Every Step 5K takes place on January 10, 2026 in Modesto, California. The event is a 5K run/walk on a 3.1-mile course using the trails at East La Loma Park, located at 2001 Edgebrook Drive, Modesto, CA 95355. Proceeds and donations from the event will benefit the Sutter Pediatrics Departmen..

The Crystal Springs Trail Run takes place on Sunday, January 18, 2026, at Huddart Park (Werder Shelter), 1100 Kings Mountain Road, Woodside, CA 94062. The event offers the following distances: 8K - Elevation gain 710'; Single Track 48%, Dirt Road 40%, Asphalt 12% Half Marathon - Elevation gain 2,1..

The Crystal Springs Trail Run takes place at Huddart Park (Werder Shelter), 1100 Kings Mountain Road, Woodside, CA. The event includes the following distances: 8K Half Marathon 35K Marathon 50K Kid's Run (6yo & younger, 50 yd dash) - Free Race-day check-in begins at 7:00 a.m. at Huddart Park..

The event takes place on January 24, 2026 at San Pedro Valley County Park in Pacifica, California. Distances offered: 30K : 18.9 miles, 4,300' elevation gain Half Marathon : 13.2 miles, 3,100' elevation gain 10K : 6.0 miles, 1,200' elevation gain The event has a capacity of 350 runners. All races..

Brazen Racing's Coyote Hills event takes place at Coyote Hills Regional Park in Fremont, California. The weekend offers three distances: a half marathon, 10K, and 5K, with walkers welcome and a Half Marathon Hiker Division for those taking longer than four hours. The course features a mix of paved,..

Mt. Umunhum Trail Conquest-Winter is an endurance trail running event in San Jose, California, starting at the Hacienda Entrance of Almaden Quicksilver County Park. Runners can choose 5K, 7 Mile, half marathon, 30K, trail marathon, 50K, and a Kids Run.The 30K climbs Bald Mountain, while the Trail Ma..

Monterey Ultra is a 50-mile trail ultramarathon set in Fort Ord National Monument near Monterey, California. Local runners designed a varied course that combines a 35-mile loop and a 15-mile loop, with wide fire roads, twisting single-track, deep sand, and rocky, rooty climbs, totaling about 7,080 f..

The Fort Ord Trail Run is held at Fort Ord National Monument / Laguna Seca Recreation Area near Salinas, CA. The event offers three trail distances: 50K (31.0 miles, 4,300 ft elevation gain) 25K (16.3 miles, 2,250 ft elevation gain) 10K (6.4 miles, 900 ft elevation gain) The event has a total cap..

The Bay Breeze race takes place on February 14, 2026, at San Leandro Marina Park, 14001 Monarch Bay Dr, San Leandro, CA 94577. The event offers the following distances: Half marathon 10K 5K A remote-run option is listed for the event. All race distances start and finish at San Leandro Marina Par..