In-N-Out Burger, a fast-food chain originally founded in California in 1948, has unveiled plans to host a custom Tough Mudder event in September 2025.
Obstacle course racing (OCR) series Tough Mudder has confirmed the deal that will see its team facilitate a first-of-its-kind custom event for the Californian burger chain.
The event will commence on Friday, September 5, 2025, with dedicated racer waves for In-N-Out associates, friends, and family.
In the afternoon of Friday, September 5th through Sunday, September 7th, waves of the obstacle course event will be open to the general public at Big Bear Mountain Resort in southern California. Tough Mudder expects to see attendance of more than 15,000 throughout the event weekend.
100% of ticket sales on Friday will benefit the Slave 2 Nothing Foundation. A portion of the proceeds will also benefit the foundation on Saturday and Sunday. Created by In-N-Out Burger, the Slave 2 Nothing Foundation has a mission to free people from being enslaved to any person or substance. The foundation provides financial support to organizations in eight US states and local communities.
Big Bear Mountain Resort will play host to the event that will have 5K and 10K courses with mountainous scenery and innovative obstacles. Alongside the regular festivities Tough Mudder participants may have come to expect, In-N-Out will be enticing participants with free burgers from its on-site cookout trucks while finishers will be presented with a custom headband, finisher tee, medal and lanyard.
Participants will also have the opportunity to take part in a variety of exclusive brand activations throughout the event village.
Tough Mudder owner and Spartan Race Founder Joe De Sena said “Tough Mudder is all about overcoming challenges and savouring the reward. We’re thrilled to partner with In-N-Out and Slave 2 Nothing to give back to the community and provide an unmatched on-course and finish line experience – burger and all.”
In-N-Out Burger President and owner Lynsi Snyder-Ellingson said “My husband Sean and I have completed a Tough Mudder and recognize it takes determination, stamina, strength, and teamwork.
“Slave 2 Nothing recognizes these same qualities are crucial in tackling the issues of addiction and human trafficking. We’re incredibly thankful for this partnership with Tough Mudder and the opportunity to host such a unique event. Together, we can impact even more lives by helping them find freedom from being enslaved to any person or substance.”
www.toughmudder.com
www.in-n-out.com







