Napa Valley Endurance Run

The Napa Valley Endurance Run is a challenging trail running event held in Calistoga, California, starting and finishing at the Calistoga Fairgrounds. It offers four race distances: 50k, 35k, half-marathon, and 10k, all traversing scenic and rugged terrain through Robert Louis Stevenson State Park and up to Mount St. Helena.

The courses feature steep climbs, technical single-track trails, and expansive views of Napa Valley, with the 50k boasting over 7,500 feet of elevation gain. Aid stations are well-stocked but spaced widely, requiring runners to carry ample water. The event is a UTMB Index race and is known as one of California’s toughest mountain trail races, attracting serious endurance runners. Visit the organization's website for the most recent information.