O2X Summit Challenges obstacle races, mud run, and OCR information, distance, cost, dates, calendar, discounts, obstacles, reviews, and more

O2X Summit Challenges are authentic, original mountain-running races with naturally occurring obstacles, all designed to push your personal limits and achieve your individual best. That’s the promise and goal of O2X Summit Challenges. Whether you’re an outdoor enthusiast, runner, obstacle course race fan, hiker or health enthusiast, these base-to-peak competitions offer a new and unforgettable opportunity to experience physical and mental growth – all fostered in a spirit of environmental awareness and sustainable living. These aren’t merely running challenges. They’re experiences of a lifetime.

Upcoming O2X Summit Challenges Events

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  • Race discount More info
  • September 23, 2017
    Waterville New Hampshire O2X Summit Challenges 2017
    Loon Mountain Resort, Lincoln, NH, United States
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  • September 24, 2017
    Waterville New Hampshire O2X Summit Challenges 2017
    Loon Mountain Resort, Lincoln, NH, United States
      Learn More

Browse our calendar of previous mud runs, mud races & obstacle races for O2X Summit Challenges

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