Trail Running calendar near San Leandro 2025-2026

Run the Lag Bon 10K on March 22 in Fairfax on a scenic, technical Lagunitas trail with roots, rocks and muddy sections. This small charity race supports World Water Day with proceeds to safe water programs and runners get a shirt and medal.

Run along the historic Western Pacific Trail at Quarry Lakes in Fremont on March 28, 2026, with 5K, 10K and half marathon options plus a remote runner category. Mostly flat dirt and gravel trails make for a scenic, friendly race for all pac..

Run with sweeping views of the Golden Gate Bridge, San Francisco Bay and Pacific Ocean on scenic trails in the Marin Headlands. Choose Marathon, Half Marathon or 10K on April 4, 2026 in a 400 runner field for an intimate coastal challenge.

Join the Diablo Trails Challenge on April 4, 2026 at Mount Diablo with distances from 5K to 50K on scenic but demanding trails. A portion of entry fees benefits Save Mount Diablo and race day photos and a BBQ add to the experience.

Run Angel Island on a scenic hilly loop with sweeping Golden Gate, Alcatraz and Bay views. Choose a 10K or a half that circles the island twice at the 35th annual event limited to 400 runners, ferry included.

Lake Sonoma race weekend in Geyserville on April 11, 2026 hosts a Western States qualifying 100K, a rolling 50K, and the Trail Sisters half for women. Expect scenic lake overlooks, lively aid stations, and campground vibes.

Join the SPASM Lake Chabot Trail Run on April 11 for scenic loops around Lake Chabot with distances from 8K to 50K for every level. Enjoy rolling hills, color coded trails, tech shirts for pre registered runners and custom finisher medals.

Run scenic single track through Robert Louis Stevenson State Park at the Napa Valley Endurance Run in Calistoga on April 12, 2026. Choose 50k, 35k, half marathon or 10k with big climbs, summit views from Mount St Helena and aid stations.

Enjoy springtime trails at Del Valle Regional Park with the Badger Cove Half Marathon, 10K, 5K or remote option on April 18, 2026. Scenic lake routes, chip timing, finisher medal and tee make it a great day for runners and walkers.

Run the scenic Horseshoe Lake Trail Run at Skyline Ridge in La Honda on April 18, 2026, with distances from 5 mile to 50K and a free kids dash. Expect rolling ridge single track, aid stations, and a friendly festival atmosphere.

Run scenic trails around Annadel State Park in a community fundraiser with a half marathon, 10K and 5K. Celebrate Earth Day with cup free aid stations and help support Trione Annadel State Park and Sonoma County Parks Foundation.

Take on San Carlos trails at No Foolin' Foot Race on April 18 at Crestview Park, with courses from a kids 1K to a long course with big climbs. Enjoy a festival finish, pro timing, tech shirts and photos while helping maintain local trails.

Run the scenic 38th Mt Tam Wild Boar at Mt Tamalpais State Park on April 25 2026, choose the half marathon or 10K, and enjoy coastal ridge views and single track trails. Field limited to 300 so register early.

Tackle the iconic Miwok 100K through the Marin Headlands on May 2, 2026, where redwoods, ridgelines, and coastal views await. Limited to 400 runners, this supported trail ultramarathon blends rugged challenge with community and sustainabili..

Join Tails & Trails on May 3, 2026 in Windsor CA to support Dogwood Animal Rescue with a fun 5K, Dogwood Dash, or virtual option. Bring your pup for a dog friendly run and help animals in need.

Run from Stinson Beach into the towering redwoods of Muir Woods on a scenic, rugged trail with ladders, stairs and scrambling sections for an adventurous challenge. Limited to 300 runners, this intimate race on May 9 2026 offers marathon, h..

Run scenic single track and dirt roads around Lake Anza in Tilden Regional Park, Berkeley, with distances from a family friendly kids dash to a tough 50K. Pre registered runners get shirts, all finishers earn custom medals and aid stations..

Trailquake 2026 in Saratoga on May 10 delivers scenic, climbing single track trails with half marathon, 10K and 5K options for runners and walkers of all abilities. Presented by Brazen Racing with shirts and awards for finishers.

Explore Napa's Skyline Wilderness Park on May 16 with 50K, 30K, half marathon and 10K trail runs through rim rock climbs and panoramic views of Mount Diablo, Mount Tam and Mount Saint Helena. Aid stations and on course support keep you movi..

Celebrate the 15th anniversary of Run for Amma, a charity trail run at Skyline Ridge supporting UCSF cancer research. Choose from challenging 50K and 30K routes or a scenic 10K, and enjoy community support from volunteers and local clubs.