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  • An athlete with goggled climbing up the hill at the Tough Mountain Challenge at Sunday River.
    Walls, Hills, Hurt

    Tough Mountain Challenge

    Want a prime heat? Better move—early spots go faster than your grip on a muddy wall.

    Register NowNeed More Info?
  • A young child competing in the Mini Mountain Challenge
    Let the kids loose

    Mini Mountain Challenge

    Registration for 2026 opening in the fall!

    Mini Mountain
  • A group of athletes finishing the line of the Tough Mountain Challenge
    All the Dirty Details

    About The Race

    Need more convincing? Okay, here are some more details.

    Don't Chicken Out