California fast food powerhouse In-N-Out Burger forges unlikely partnership at popular competition

Over 15,000 participants are expected to attend, tackling 5K and 10K obstacle courses set against stunning mountain scenery.Photo byWonUnsplash

In a unique collaboration, In-N-Out Burger is partnering with Tough Mudder for a custom endurance event benefiting the Slave 2 Nothing Foundation. The event will take place from September 5-7, 2025, at Big Bear Mountain Resort in California.

Starting with exclusive waves for In-N-Out Associates, friends, and family on September 5, the event will open to the public from the afternoon of September 5 through September 7. Over 15,000 participants are expected to attend, tackling 5K and 10K obstacle courses set against stunning mountain scenery.

All ticket sales from Friday will benefit the Slave 2 Nothing Foundation, which fights addiction and human trafficking. In-N-Out will also offer free burgers to participants from its on-site cookout trucks, and finishers will receive custom headbands, tees, and medals.

In-N-Out President Lynsi Snyder-Ellingson, a Tough Mudder participant herself, expressed excitement about the partnership and the opportunity to further the Foundation's mission.