About This Race
The 100-mile distance represents the ultimate test of endurance on Antelope Island, demanding exceptional preparation and mental fortitude. This longest option takes runners through the full spectrum of the island's terrain and moods, from predawn darkness to the heat of midday sun. The course challenges even veteran ultrarunners with its remote setting and the psychological demands of covering such distance in this isolated environment.
The course traverses Antelope Island's diverse terrain of rolling hills, ridgelines, and open grasslands with commanding views of the Great Salt Lake. Runners navigate a mix of singletrack trails and dirt roads across the island's unique high desert ecosystem. The terrain features moderate but persistent climbs and descents, with the island's highest peaks providing panoramic vistas of Utah's Wasatch Mountains and the expansive salt lake below.
Elevation Profile
Elevation profile estimated from terrain data. Actual course may differ.
The course gains 11,056 ft over 100 miles, with the steepest section between mile 7–mile 7.
Location
Practical Info
Late March in Utah typically brings cool to mild temperatures with potential for variable spring weather including wind, rain, or snow.
SLC - Salt Lake City International Airport
Syracuse and nearby Layton offer hotel options, with Salt Lake City providing more extensive accommodations about 45 minutes away.
Best For
Notable Features
The race takes place entirely on Antelope Island, a 42-square-mile island in the Great Salt Lake that serves as a state park and wildlife preserve. Runners share the trails with free-roaming buffalo herds, pronghorn antelope, and other wildlife in one of Utah's most unique natural settings. The island's isolation creates an intimate racing experience with dramatic views across the Great Salt Lake to the Wasatch Mountains.