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The Tetons offer so many trails you’ll need years to cover them all. Trail running clubs organize events every week in the summer and the location is different every time. The paths, which usually start or pass the base of Jackson Hole Mountain Resort, are marked. People like to run along the pleasant Valley Trail, the Rock Springs Yurt Trail, which is a bit more challenging because it changes in elevation, and the 6-mile Phelps Lake Loop.