California Mud Run & Obstacle Race Calendar 2025-2026

The NorCal Spartan Event Weekend takes place at Mahon Ranch in Elk Grove, California, near Sacramento. This exciting obstacle course race weekend features multiple race options, including a 5K Sprint with 20 obstacles, a 10K Super with 25 obstacles, and kids' races ranging from 1 to 3 kilometers with obstacles. Participants will experience scenic landscapes, rivers, and rolling trails designed to challenge both beginners and elite athletes. Additional events include the Hurricane Heat endurance challenges and a Trifecta Pass for those who want to complete all three main distances. The event promotes camaraderie, resilience, and team participation, with special discounts for service members. Visit the organization's website for the most recent information.

The In-N-Out Burger Tough Mudder Challenge is a dynamic obstacle course event held at Bear Mountain Resort in Big Bear Lake, California. Scheduled for September 5–7, 2025, it features two race distances: a 10K with over 20 obstacles and a 5K with more than 12 obstacles. The event fosters a spirited atmosphere of teamwork and endurance, with participants navigating muddy, challenging terrain.

Proceeds support the Slave 2 Nothing Foundation, which combats substance abuse and human trafficking. Participants enjoy a festive Mudder Village with In-N-Out’s signature Double-Double® meal at the finish line. Spectator passes and VIP experiences are also available, making it a community-focused weekend of fitness and philanthropy. Visit the organization's website for the most recent information.

Tough Mudder Big Bear 2025, held at Bear Mountain in Big Bear Lake, California, offers a challenging and scenic obstacle course experience. Participants can choose between a 5K course with 12+ obstacles or a 10K course featuring 20 obstacles, designed to test teamwork and endurance. The event is uniquely partnered with In-N-Out Burger, providing exclusive co-branded swag and a finisher Double-Double® meal from onsite cookout trucks. Proceeds support the Slave 2 Nothing® Foundation, combating substance abuse and human trafficking. The event also features a festive Mudder Village with live entertainment, spectator access, and VIP group packages, making it a memorable weekend of fitness and camaraderie. Visit the organization's website for the most recent information.

The Nash Ranch Mud Run, held in Redding, California, is a family-friendly 5K obstacle race featuring mud, creek crossings, hills, and various structures to climb over and crawl under. Organized by the Active 20-30 Club of Redding, this event offers a fun and challenging course through fields and natural terrain. Participants enjoy a lively atmosphere with vendors, children's activities, food, drinks, and exclusive Mud Run swag. The event supports a local nonprofit focused on improving the lives of children with special needs. The race welcomes individuals of all ages and offers multi-pack registration options for adults. Visit the organization's website for the most recent information.

The Angel Stadium Spartan Stadion Weekend, held at the iconic Angel Stadium of Anaheim in Orange County, California, features a thrilling 5K obstacle course race with 20 challenging obstacles. Participants experience a unique course that includes running up and down stadium bleachers, offering an up-close view of the home field of the Anaheim Angels. The event also includes a kids' race of 1 to 1.5 kilometers with obstacles, making it family-friendly. Racers can enjoy the vibrant atmosphere of this historic ballpark and explore nearby attractions like Laguna Beach after the race. The event encourages teamwork and offers special discounts for service members. Visit the organization's website for the most recent information.

The Temecula Spartan Event Weekend, held at Lake Elsinore Raceway in California, offers a scenic and challenging obstacle course experience along the shores of Lake Elsinore. Participants can choose from a Sprint 5K with 20 obstacles, a Super 10K featuring 25 obstacles, and kids' races ranging from 1 to 3 kilometers with obstacles. The course showcases rugged trails, rolling terrain, and stunning water views under mild Southern California September weather. Additional challenges include Hurricane Heat endurance events lasting 4, 12, or 24 hours. This event is ideal for all skill levels seeking a thrilling outdoor adventure with team options and family-friendly activities. Visit the organization's website for the most recent information.

The Mammoth Spartan Trifecta Weekend, held in Mammoth Lakes, California, offers a challenging obstacle course race set at a high altitude of 7,900 feet in the Sierra Nevada Mountains. Participants can compete in three race distances: Sprint (5K with 20 obstacles), Super (10K with 25 obstacles), and Beast (21K with 30 obstacles), plus a kids' race. The event features a mix of rugged terrain and demanding obstacles designed to test endurance and grit. Alongside the races, the weekend includes the inaugural Spartan Super World Championship and a vibrant après-race atmosphere in Mammoth Lakes’ lively village, known for its hotels, dining, and outdoor activities. Visit the organization's website for the most recent information.

The Mammoth Spartan Super World Championship Weekend, held at Mammoth Mountain Ski Area in California, is a premier obstacle course race set at a challenging high altitude of 7,900 feet in the Sierra Nevada Mountains. The highlight is the inaugural 10K Super World Championship featuring 25 obstacles designed to test even the toughest athletes. Participants can also compete in Sprint, Super, or Beast races during this action-packed Trifecta weekend. The event offers a vibrant atmosphere with access to Mammoth Lakes’ lively village, including top hotels, restaurants, and outdoor activities. Championship finishers earn exclusive swag, making this a must-attend event for Spartan racers. Visit the organization's website for the most recent information.

The Boot Camp Challenge is a 3-mile obstacle race held at the Marine Corps Recruit Depot (MCRD) in San Diego, one of only two locations where Marine Corps boot camp occurs. Open to the public for one day annually, the course features obstacles similar to those faced by Marine recruits, with encouragement from over 60 Marine Corps Drill Instructors. Designed for all fitness levels, participants can skip obstacles without penalty.

The event celebrates the 250th anniversary of the U.S. Marine Corps and offers unique prizes, including a Harley-Davidson motorcycle. Spectators enjoy free admission, entertainment, and Marine Corps cultural displays. Visit the organization's website for the most recent information.

Ruff Run California is an annual obstacle run held in Phelan, CA, set in the scenic high desert at 4,200 feet elevation. The event features a 4ishK course with over 20 obstacles that challenge participants and their dogs, testing training, teamwork, and strategy through mud, water, and mental challenges. The 2025 race includes a new course section and custom jerseys for all participants. Besides the competitive 4k wave, there are also a 4ishK fun run and a 1k fun walk/run. The event fosters a lively atmosphere with an after-party featuring music, games, and vendors, making it a fun day for both runners and their pups. Visit the organization's website for the most recent information.

The SLO CAL Spartan Trifecta Weekend takes place at Santa Margarita Ranch in Central California, set amidst scenic vineyards and the Los Padres National Forest. This challenging obstacle course event offers multiple race distances, including a 5K Sprint with 20 obstacles, a 10K Super with 25 obstacles, a 21K Beast featuring 30 obstacles, and a demanding 50K Ultra with 60 obstacles. Participants race through rolling wine country hills, grapevine rows, and open valleys, enjoying views of wildlife and unique natural features like a fossilized oyster bed. The event welcomes racers of all levels, including kids, and provides a vibrant, supportive atmosphere under sunny skies. Visit the organization's website for the most recent information.

The SoCal Spartan Event Weekend, held at Lake Perris State Recreation Area in Perris, California, offers a challenging obstacle course race experience with scenic mountain views. Participants can choose from multiple race distances: the Sprint (5K with 20 obstacles), Super (10K with 25 obstacles), Beast (21K with 30 obstacles), and a Kids Race (1-3K with obstacles). The course is described as flat and fast but demanding, set in a well-maintained park with camping facilities. The event fosters a competitive yet fun atmosphere suitable for individuals, teams, and families, making it a memorable physical challenge in Southern California’s rugged wilderness. Visit the organization's website for the most recent information.

The San Jose Spartan Trifecta Weekend, held at Woodward Reservoir Regional Park near Oakdale, CA, offers a challenging obstacle course experience across multiple race distances. Participants can choose from the Sprint (5K with 20 obstacles), Super (10K with 25 obstacles), Beast (21K with 30 obstacles), and Ultra (50K with 60 obstacles) races, plus a kids' race featuring 1-3 km with obstacles. The flat course spans over 3,700 acres of land and 2,900 acres of reservoir, providing a scenic and spacious setting ideal for testing personal bests. The event fosters a supportive atmosphere, perfect for individuals and teams aiming to push their limits. Visit the organization's website for the most recent information.

The Big Bear Spartan Trifecta Weekend, held at Big Bear Mountain Resort in California, is a challenging obstacle course event set at a high altitude of 8,200 feet. Participants face steep climbs and descents over 1,200 feet, testing endurance and strength across three race distances: the 5K Sprint with 20 obstacles, the 10K Super with 25 obstacles, and the 21K Beast featuring 30 obstacles. This extreme course offers expansive Southern California views and the chance to earn a Trifecta by completing all three races in one weekend. The event also includes a kids' race and promotes team participation, with amenities like bag check and parking included. Visit the organization's website for the most recent information.

The Monterey Spartan Event Weekend, held at scenic Toro Park near Salinas, California, offers a challenging obstacle course race experience set against the stunning backdrop of coastal woods, rolling hills, and ocean views. This popular Northern California event features a Sprint 5K with 20 obstacles and a Super 10K with 25 obstacles, both designed to test endurance with brutal climbs, open field sprints, and punishing obstacles. The weekend also includes kids' races, making it family-friendly. Participants enjoy a legendary course known for its rugged trails and beautiful scenery, with convenient amenities like bag check and parking included. The event encourages team participation and offers special discounts for service members. Visit the organization's website for the most recent information.