Napa Valley Endurance Run

Event overview

The Napa Valley Endurance Run is a trail running event on April 12, 2026 in Calistoga, California. The race starts and finishes at the Great Lawn at the Calistoga Fairgrounds and uses trails in Robert Louis Stevenson State Park and on Mount St. Helena. Distances offered include:

• 50K
• 35K
• Half Marathon
• 10K

The 50K, 35K, and Half Marathon are UTMB Index races.

Courses and logistics

All courses are out-and-back and run on single track and fire road with one crossing of Highway 29. Key trail sections include Oat Hill Mine Trail, the Palisades Trail, Table Rock, and the Mount St. Helena Trail. The 50K has about 7,250 feet of net elevation gain/loss; the 35K about 5,250 feet; the Half Marathon about 4,250 feet.

Aid and support are limited in some stretches; organizers recommend carrying up to 40 ounces of water. Aid station details:

• 50K: three aid stations visited six times (approximate mile points 6.5, 10.5, 14, 17, 20.6, 25).
• 35K: three aid stations at about miles 6.5, 10.5, and 15.
• Half Marathon: water at mile 1 and mile 12, and a stocked Palisades aid at the turnaround.
• 10K: water-only aid at mile 1 and 5.2.

Drop bags are delivered to the Highway 29 area and may be accessed twice; bags must be clearly marked. Runners who do not reach the Highway 29 aid station by 11:45 will be routed to the 35K course, and there is a hard cutoff at Highway 29 on the return to manage finish times. Pre-race and race-day bib pickup options are provided. All finishers receive a medal and a shirt; awards are given to top finishers by gender and age-group where applicable. Visit the organization's website for the most recent information.