Trail Running calendar near Riverbank 2026-2027

Experience the scenery of Tilden Regional Park at the Grizzly Peak Trail Run. Choose from various distances including a 50K and marathon starting from the shores of Lake Anza in Berkeley.

Trail ultramarathons in Almaden Quicksilver County Park on May 9 2026, offering a 100K and a 50K with substantial elevation gain, course maps and GPX files, USATF sanctioning, aid stations, volunteer support, swag and a post race party.

The 24th annual Los Altos Hills Pathways Run/Walk is a trail run and walk on May 9, 2026 at Westwind Community Barn in Los Altos Hills, CA. Routes include 5 km and 10 km with course maps and past results available online.

Trail races from 5K to 50K around Jenkinson Lake on May 9, 2026, with a 100 runner daily cap. Parking and registration are at the Scales Parking Lot; most distances finish at the Waterfall Trailhead and a $5 day use fee applies.

An annual fundraiser at Shell Ridge Open Space in Walnut Creek supporting Sustainable Contra Costa and its youth program SLIA. Options include a 5K trail run, two 1.4 mile walking activities, and educational talks by local experts.

Trailquake 2026 is a trail event in Saratoga on May 10 offering 5K, 10K and a half marathon through redwoods and pine forest, with local and remote entry options and finisher shirts.

A community Mother's Day event at Pinto Lake County Park on May 10, 2026 offering a 1K family fun run, 5K run and walk, and 10K run to benefit Pajaro Valley Shelter Services.

Run for Amma is a charity trail event on May 16, 2026 at Skyline Ridge Open Space Preserve near Los Gatos. Multiple distances from 10K to 50K are offered and all registration proceeds support UCSF cancer research.

A race in El Sobrante on May 16, 2026 offering Half Marathon, 10K and 5K distances plus a remote runner option. Tiered registration fees apply and the event supports the East Bay Regional Parks Campership Program.

A spring running event in Roseville on May 16, 2026 offering a half marathon plus a 5K run and a noncompetitive 5K walk, all on paved local trails with aid stations and participant swag.

A point-to-point Half Marathon on May 16, 2026 in Almaden Quicksilver County Park, running from Mt. Umunhum down to the Hacienda Entrance with 1,909 ft of ascent, marked ribbons, aid stations and a 5.5-hour time limit.

Mud Factor Sacramento is a 5K mud and obstacle run on May 17, 2026 at the 300-acre Mahon Ranch, marking the event's 15th anniversary; it features adult and KIDZ family waves and a $10 spectator festival pass.

A trail event on the El Dorado Trail in Placerville on May 23, 2026, offering distances from a kids run to a half marathon, paved and unpaved sections, aid stations, color-coded course markings, and medals for finishers.

Nitro Trail on May 30, 2026 at Point Pinole Regional Shoreline Park features a half marathon, 10K and 5K plus a remote runner option. A hiker start is available for half marathon walkers and the event supports a parks campership program.

Experience a technical trail race through the redwood groves of Joaquin Miller and Redwood Regional parks. Choose from multiple distances ranging from an 8K to a 50K ultra marathon on accurately measured courses.

A community 5K and 10K run/walk at Seal Point Park in San Mateo on May 30, 2026, paired with a complimentary Wellness Fair. Race registration includes a t-shirt and finisher medal and team entries are eligible for a prize.

A multi-distance trail event at Calero County Park in San Jose on May 30, 2026, featuring single track, dirt paths and hilly terrain up to 50K, with aid stations, free parking and drop bag support for the 50K.

A trail running event in Arnold, California on May 31, 2026 offering distances from 50k to 5k around White Pines Lake and the Arnold Rim Trail, with proceeds supporting the Arnold Rim Trail Association.

Global Running Fest at Sports Basement Berkeley on May 31 features free road, trail, and kids runs, brand shoe demos, live music and raffles with over $5,000 in prizes. Beer sales benefit the youth program Running for a Better Oakland.

Trail runs of 50k and 20k near Yosemite, with a start and finish at Camp Green Meadow Outdoor School and aid stations every 5 to 7 miles. The 50k passes Nelder Grove sequoias and includes overall and age-group awards.