Teton Dam Marathon

East of Rexburg, wide-open farm country and the Teton River valley set the stage for a marathon with real historical weight. The course follows roads shaped by the 1976 Teton Dam flood, giving runners a quiet, reflective backdrop as they move through fields framed by distant peaks.

Distance options multiply the event’s appeal: alongside the marathon, half-marathon, relay and 5K courses let a whole family take part at whatever level suits them, from a competitive relay team to a first 5K. Fields have topped 1,000 participants in past years, and the early-morning start means the valley is at its coolest and quietest when the gun goes off.

Because the course runs through rural country with limited services, arriving in Rexburg the night before is the practical move rather than an afterthought. Once the race wraps, the reward is close at hand: Mesa Falls thunders less than an hour away, the South Fork of the Snake River offers easy family floats, and Yellowstone’s western entrance is a short drive further, turning race weekend into the start of a longer eastern Idaho itinerary.