Trail Running calendar near Simi Valley 2025-2026

The Catalina Island Half-Marathon & 10K is a scenic trail running event held in Avalon, California. The half-marathon covers 13.1 miles, starting in Avalon and passing the historic Wrigley Mansion before entering Catalina Island’s rugged interior. Runners face challenging climbs leading to breathtak..

The Rock Cobbler Trail Run is a challenging off-road trail running event held at Rio Bravo Ranch in Bakersfield, California. Featuring a tough course with roughly 26 miles (41.8 km) and 4,500 feet of elevation gain for the full route, and a shorter 13-mile (20.9 km) option, the run promises a rugged..

The Chino Hills Trail Run Series, held at Chino Hills State Park in Brea, California, offers challenging trail races in scenic natural surroundings. The fall event features 30K and 50K distances, with well-marked courses that traverse hilly terrain and showcase native plants and wildlife. Aid statio..

The 4 Mile Hill Challenge is a rolling, all-trail race held at Debs Park in Los Angeles, with the Audubon Center at Debs Park serving as the start and finish. The event features a 4-mile run/walk/hike and a Run4Paws (Love Your Pet) division, making it pet-friendly. The course starts at Griffin Avenu..

The Fremont Canyon 28k Trail Run is an exciting running event taking place in Irvine Regional Park, Orange, California. Scheduled for December 6, 2025, this challenging 28k (17.5 miles) course features fire roads with an elevation gain and loss of 2860 feet, making it suitable for experienced runner..

The Ray Miller 50/50 is a trail running event held at Point Mugu State Park in Malibu, California. Scheduled for December 6, 2025, the race offers three distance options: a 50-mile ultra, a 50K, and a 30K. The course takes runners through the scenic terrain of the state park, known for its natural b..

Crystal Cove Trail Run, the SoCalTrail season finale, unfolds in Crystal Cove State Park, El Moro, Laguna Beach, just minutes from Orange County’s beaches. Runners choose between the El Moro 15k (9.35 miles with 1,647 ft of elevation gain) and the Cut-Across 6k (4.1 miles, 696 ft), plus a Kids 1k co..

The Hanukkah 8 Krazy Kilometers is an annual family-friendly running event held at Panorama Vista Preserve in Bakersfield, California. Participants can choose between an 8K race and a 2K Latke Loop Fun Run/Walk, both set on scenic trails along the Kern River beneath the Panorama Bluffs. The event ce..

The Paramount Ranch Trail Runs, held in Agoura Hills, California, offer a variety of race distances including 50K, marathon, 30K, half marathon, and 10K. Set on scenic trails within the historic Paramount Ranch, the event provides runners with a challenging and picturesque course. The race atmospher..

The Mt. Hollywood 12K Trail Run Hike will take place in Los Angeles on Sunday 25 January 2026. You can run between 5 and 8 miles.

Sean O'Brien 100K/50M/50K/26.2/30K is a trail ultramarathon event in Calabasas, California (1925 Las Virgenes Road). It offers five distances: 100K, 50 miles, 50K, marathon, and 30K, giving athletes a range of challenging options on scenic trail terrain. The race is part of the Sean O’Brien Trail Ru..

Boney Mountain Trail Run takes place in Thousand Oaks, California, starting from Rancho Sierra Vista / Satwiwa in the Santa Monica Mountains. It offers a Half Marathon (13.1 miles, ~2,780 ft gain) and a 7k Trail Run (4.4 miles, ~664 ft gain). Runners traverse backcountry canyons of Point Mugu State..

ABetterWorldRunning hosts the Happy Valentine’s Day Grand Prix in Griffith Park, Los Angeles. The event offers multiple distances: 5k, 10k, 15k and a half marathon. The course uses dirt trails on a shared path with pedestrians and equestrians, marked with cones and signs, and runners are asked to ke..

The Santa Barbara Nine Trails is a trail running event held in Santa Barbara, California, featuring two distance options: 35 miles and 17 miles. Organized by AllWeDoIsRun, the race takes place on scenic trails along the California Central Coast, offering runners a challenging and picturesque course...

The Nine Trails 35 Mile Endurance Run is a trail running event held in Santa Barbara, California. It offers two distance options: a challenging 35-mile course and a shorter 17-mile route. The event takes place on scenic trails, providing runners with a beautiful and rugged outdoor experience along t..

The Catalina Island Marathon, along with its 10K and 5K distances, takes place in Avalon, California on Catalina Island. The event features the full marathon (26.2 miles), a 10K (6.2 miles), and a 5K (3.1 miles), plus a Kids Run, drawing runners to the island’s scenic trails. It is the oldest trail..

VALENCIA Trail Race takes place in Valencia, California, offering three trail distances: 10K, Half Marathon, and 50K Ultra. Set amid Southern California’s hills, the course climbs to peaks, follows ridgelines, and traverses canyons with panoramic views of the Santa Clarita Valley. The route is 70% s..

Billy Goat Mountain Climb takes place in Silverado, California, in the Cleveland National Forest, with the start/finish on Maple Springs Road near Lost Woman Canyon. The event offers three distances: the Silverado Loop at about 17 miles with roughly 3,800 feet of elevation gain; a half-marathon clim..

Hoppy Easter in Griffith Park, Los Angeles, is an open-course running festival organized by ABetterWorldRunning. The event offers 5k, 10k, 15k, and a half marathon, all run on a dirt trail within the park. The course is marked with cones and signs on a shared path, with pedestrians and equestrians s..

Nature Made Great Race takes place in Agoura Hills, California, offering multiple distances: Chesebro Half Marathon (mostly trail with scenic canyon and meadow views), Old Agoura 10K, Deena Kastor 5K, United Track 1 Mile, plus the 15K Combo and 10‑Mile Triple Stack. The event showcases scenic, USATF..