The Round Valley Rambler offers two distances, 7K or a trail half marathon. The half marathon distance is the first race in the Triple Trail Challenge. 100% of the course takes place on buff single and double track trails within the 2,100 acre, Round Valley Open Space, with altitude ranging from 6,500 to 7,100 feet. While athletes will find the trails foot-friendly, the rolling, high-desert terrain presents a few long and steady climbs followed by fast downhills.