Trail Running calendar near Brea 2025-2026

The Green Valley Lake Half Marathon, held in the San Bernardino Mountains between Running Springs and Big Bear, offers a scenic and challenging race experience. The course begins with a flat 3/4 mile loop along the lake, then ascends gradually with a 400-foot climb to a forest service road featuring..

The Angeles Crest 100 Mile Endurance Run, held annually since 1986, is a challenging point-to-point ultramarathon in the San Gabriel Mountains of Southern California. Covering 100 miles from Wrightwood to Altadena, the course features elevations from 1,135 to 9,300 feet, with steep climbs, rocky ter..

The Riley Park Trail Races, held in Thomas F. Riley Wilderness Park in Orange County, California, offer a variety of distances including a 30k, half marathon, 10 miler, 10k, 5k, and a unique 6-hour race. This family-friendly event features scenic single and double track trails, providing a fun and c..

The Into the Wild OC Trail Run is a 5K trail race held at Saddleback Wilderness in Orange, California. The course features a mix of fire roads and single-track trails with an elevation gain of 300 feet, offering a moderately challenging run through natural terrain. Participants will find one aid sta..

The Trip to: Lake Calavera Trail is a moderately challenging 4.9-mile hiking event held near Carlsbad, California. The trail takes participants around Lake Calavera and ascends to the summit of the volcano, offering scenic views and a rewarding outdoor experience. The event is open to active duty mi..

The Bulldog Ultra is Southern California's oldest 50k trail race, held in the scenic Santa Monica Mountains at Malibu Creek State Park in Calabasas, CA. Celebrating over 30 years, it offers two challenging distances: a 50k ultra with 29.4 miles and 5,784 feet of elevation gain, and a 25k trail run c..

The OC Trail Runners Group Run is a free, social, and non-competitive trail running event held in Newport Coast, California, at El Moro and Laguna Coast Wilderness Park. Designed for runners with some trail experience, the group enjoys a relaxed pace and changing routes each time. The upcoming run c..

The Mount Baldy Run to the Top is a challenging 7-mile trail race held in Mount Baldy, California. Celebrating its 60th running, the race starts at 6,000 feet elevation and ascends 4,000 feet to the summit of Mt. Baldy, the third tallest mountain in Southern California at 10,064 feet.This event serv..

The Gypsum Canyon Wilderness 5k is a trail running event held at Gypsum Canyon Wilderness in Anaheim, California. The 3.3-mile course features a mix of fire roads and single-track trails with an elevation gain of 350 feet, offering a moderately challenging run through natural terrain. Participants w..

That's No Moon Trail Races, held in Silverado, California, offers challenging trail running events in the rugged Cleveland National Forest and Santa Ana Mountains. The race features three distances: 50 miles, 50 kilometers, and 30 kilometers, all characterized by significant elevation gains, technic..

The Double Peak Challenge is a distinctive outdoor running event held in San Marcos, California, featuring a challenging 10K race, a 5K fun run, and a Kids Trail Trot. The 10K course is known for its demanding elevation gain of 1,176 feet, culminating at Double Peak's summit at 1,558 feet, offering..

The Cheeseboro Canyon Trail Run, held in Cheeseboro National Park near Agoura, California, offers a variety of distances including a challenging 50k ultramarathon, a half-marathon, a 5k trail run, and a kids' 2k fun run. The course features diverse terrain with runnable ascents, winding singletracks..

No Name 5025 is a trail running event held at Cheeseboro Canyon in Agoura, California. It features multiple race distances including a challenging 50k ultramarathon, a half-marathon, a 5k trail run, and a kids' 2k fun run. The course offers diverse terrain with runnable ascents, winding singletracks..

The Bandit Ultra Trail is a premier trail running event held in Simi Valley, California, at Corriganville Park. Set against the scenic backdrop of Rocky Peak's mountains and steep canyons, the race offers stunning views of sandstone boulders, oak savannahs, and diverse wildlife habitats. Participant..

The Angeles National Forest Trail Race, celebrating its 20th anniversary, takes place in the scenic San Gabriel Mountains at Mt. Wilson, California. Offering two challenging distances, the 25K features 3,500 feet of elevation gain, while the 50K includes 7,000 feet, both starting and finishing at th..

The HOKA Kodiak Ultra Marathons by UTMB is a challenging trail running event held in Big Bear Lake, California, a rustic mountain town near Los Angeles. The race spans two days with five distances ranging from 10.4 km to 159.3 km, featuring significant elevation gains up to 4100 meters. Runners expe..

Live Oak Odyssey is a fixed-time trail running event held at O'Neill Regional Park in Trabuco Canyon, California. Participants choose between 3-hour and 6-hour races on a scenic 2.75-mile loop featuring approximately 500 feet of vertical gain per lap. The course offers a mix of uphills, downhills, s..

The Rock It in Chino Hills 5K & 10K is a trail running and hiking event held at Chino Hills State Park in Brea, California. Participants can choose between a 5K or 10K course that showcases the park's stunning and expansive trails, offering scenic views and a tranquil outdoor experience. The race in..

The Cahuilla Rez Ultra, held on the Cahuilla Indian Reservation in Anza, California, offers a unique running experience with distances including a 100-mile race, 24-hour, 12-hour, 6-hour events, a half marathon, and a Tribal Member 5k. The ultra races feature a 2-mile loop on double track dirt roads..

The SPACEROCK Trail Race is an exciting trail running event held at the iconic Vasquez Rocks Natural Park in Agua Dulce, California. Scheduled for October 18, 2025, it offers multiple race distances including a challenging Half Marathon+ (just under 14 miles with over 3,200 feet of elevation gain),..