Tough Mountain Challenge
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Tough Mountain Challenge, July 25, 2026
Tough Mountain Challenge is a 5K obstacle race held at Sunday River in Newry, Maine on July 25, 2026. The course runs through mountain terrain and includes mud, water, walls, woods, and a series of obstacles.
For 2026 the course adds two new obstacles. The event weekend includes an evening slopeside gathering called the Big Ass Bash on the Friday before the race, with live music and beer tents at South Ridge.
The organizer offers lodging deals for the event weekend, with early registrants able to access discounts up to 20 percent using promo code TMC. A separate Mini Mountain Challenge for children is also listed for 2026 and has its own registration.
The presentation focuses on the physical course and weekend activities rather than timed competition. The event materials describe a high-contact, outdoor obstacle experience set on resort terrain with on-site weekend programming. Visit the organization's website for the most recent information.
