Join a bunch of other crazy endurance athletes (2 and 4-legged) in City of Rocks National Reserve on Saturday, June 3rd. Come enjoy the chance to run a fully supported loop through City of Rocks National Reserve and Castle Rocks State Park. Test your mettle on courses that climb through the most beautiful terrain in southern Idaho. This is a no-frills event that is run in conjunction with an equine endurance ride. Distance changes are welcome before AND during the race.