Trail Running calendar near Monterey County 2025-2026

The Mt. Umunhum Marathon, Race to the Top and Down, is a challenging trail running event held in Almaden Quicksilver County Park, San Jose, California. This marathon features a rugged course that begins at the Hacienda Entrance and ascends to the summit of Mt.Umunhum, one of the prominent peaks in t..

The 2025 Big Sur Trail Marathon, Half Marathon & 5 Mile, the 35th annual edition, takes place at Andrew Molera State Park in Big Sur, California. It offers three distances: marathon, half marathon, and 5 miles, with a field limited to 300 participants. Runners follow the Old Coast Road, rewarded wit..

Pacifica Summit Run, staged at San Pedro Valley State Park in Pacifica, California, features 10K and half-marathon trail races hosted by Urban Coyote Racing. Runners enjoy postcard views of the Pacific Ocean coastline and plenty of switchbacks as they ascend the summit on the upper San Francisco Pen..

Dick Collins Firetrails is the 42nd annual trail event presented by Scena Performance at Lake Chabot Regional Park (17936 Lake Chabot Rd). The event comprises multiple trail races on East Bay regional trails, including sections on Dinosaur Ridge, the Garin-Chabot Trail, Skyline Gate, Reinhardt Redw..

Spartan Trail San Jose Challenge takes place at Sanborn County Park in the eastern Santa Cruz Mountains near Saratoga, California, with the race site at West Valley College Parking Lot 5. The event offers three trail distances: 50K, 21K, and 10K. Runners tackle well‑groomed yet steep and difficult t..

The Trailblazer Race in Mountain View, CA, is an annual family-friendly event featuring 10K and 5K runs, plus a 3-mile walk along the scenic Stevens Creek Trail and Shoreline Park. The courses are fast, flat, and stroller-friendly, offering beautiful views of wildlife, salt ponds, and surrounding mo..

Run by the Sea is an annual running event held at Wilder Ranch State Park in Santa Cruz, California. Scheduled for October 5, 2025, the race offers three distances: a 4K run/walk, a 12K run, and a half marathon. The courses primarily follow flat, packed dirt trails along the scenic coastal bluffs of..

The Mt. Umunhum Trail Conquest-Fall is a trail running event held at Almaden Quicksilver County Park in San Jose, California. The race offers multiple distances including a 5K, 7 Mile, Half Marathon, 30K, Trail Marathon, and 50K.The longer courses venture into the scenic Sierra Azul Open Space Prese..

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..

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..

Haunted Hills 10K, held in Redwood City, California, blends Halloween fun with a competitive run on October 25, 2025. Runners choose the 10K or 5K course, weaving through neighborhoods decorated for the season. Participants form teams of 1–5 and carry headlamps or flashlights.It's trick-or-treating..

ZombieRunner Halloween is held at Hellyer County Park (Buena Vista Pavilion) in San Jose, CA, along the Coyote Creek trail. The event features distances of 5K, 10K, Half Marathon, and Marathon, plus youth options: 5K for under 12, 5K and 10K for ages 13-17, and a free Kid's Run (6 and younger, 50 yd..

Almaden Hills Trail Run - Fall takes place in Almaden Quicksilver Park in San Jose, California. The event offers multiple distances: 50K, Trail Marathon, 30K, Half Marathon, 8 Mile, 10K, and 5K, appealing to a wide range of runners. The course combines 60% dirt roads and 40% single-track trails, and..

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..

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..

Mermaid Trail Run - Woodside takes place at Huddart Park in Woodside, CA. The event offers multiple distances: 3, 6, and 9 miles, a Half Marathon, a 6 Hour Challenge for individuals or two-person relays, a Virtual Run, and a Mermaid Dash for kids ages 6-12 (1 mile). The course winds through towering..

Last One Standing at Bradley, California, is a unique endurance running event held at Smith Ranch featuring a 4.18-mile loop on dirt trails and ranch roads with 464 feet of elevation gain. Participants run the loop every hour and must finish within the hour to continue; those who fail are eliminated..

The Tierra Redonda Mountain Trail Run is scheduled for November 14-16, 2025 at Smith Ranch in Bradley, California (8029 Lynch Canyon Road). The event is family friendly and allows dogs on leash. Camping is available on site for up to three nights; a fee of $10.00 per vehicle per night is payable up..

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..

Quarry Turkey, held at Quarry Lakes Regional Recreation Area in Fremont, California, is Brazen Racing’s Thanksgiving weekend event featuring a fast, mostly-flat half marathon, 10K, and 5K through scenic Quarry Lakes trails. It welcomes walkers and families for a festive, turkey-themed atmosphere, wi..