Napa Valley Endurance Run

Location: Calistoga, California, in Napa Valley. Distances: 50k, 35k, half marathon, and 10k. Atmosphere: a mountain-style trail ultra with a devoted community feel, starting and finishing on the Great Lawn at the Calistoga Fairgrounds.

Course: four races depart the Fairgrounds, venturing into Robert Louis Stevenson State Park, up Oat Hill Mine Trail, onto Palisades and Mount St. Helena, with an out-and-back on mostly single-track and fire roads and a single highway crossing. Elevation: about 7,500 ft gain on the 50k (5,250 ft on 35k; 4,250 ft on half).

Special features: UTMB Index Race; abundant aid stations, drop bags, ATV-delivered Palisades aid, post-race food, and finishers medals. Visit the organization's website for the most recent information.