Tough Mountain Challenge
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Event overview
The Tough Mountain Challenge is an adventure-style obstacle race held at Sunday River Resort in Newry, Maine. The event takes place on Saturday, July 25, 2026. Registration for the 2026 main event is open.
Course and additional information
The course is approximately 5K and includes obstacles and terrain features such as mud, water, walls, woods, hills, tires, rope, muddy pits, and a slide. Photographed course elements show participants climbing a water-covered trail and negotiating walls and mud obstacles.
There is a separate Mini Mountain Challenge for children; registration for the 2026 Mini Mountain Challenge is scheduled to open in the fall. Early registrants for the main event are offered access to resort lodging deals, with advertised savings up to 20% using promo code TMC. Visit the organization's website for the most recent information.