North America’s Hardest Running Races

Whether it’s thermometer-busting temperatures, overwhelming distances, high elevations, fast descents or massive climbs, the following 24 races take competition to the extreme. Enter at your own risk and prepare to enter the pain cave. There are many other very challenging races we could have included on this list, but these epic events should be enough to get your heart racing.

PHOTOS: Colorado’s Hardrock 100

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