Antelope Island 50k
Hooper, United States • 18 Oct 2025
Event overview
The Antelope Island Fall Classic 50K is scheduled for Saturday, October 18, 2025 at Antelope Island State Park Marina. The event is organized by Buffalo Run Adventures and includes a 50K and a half marathon. Registration reopens July 21, 2025; online registration closes October 11, 2025.
- 50K : about 31.7 miles and roughly 3,900 feet of elevation gain
- Half marathon : out-and-back on the Mountain View Trail
Course, aid, and logistics
The 50K is a single loop that starts and finishes at the marina. The route goes south on the Mountain View Trail to the Fielding Garr Ranch, continues south on dirt roads and Sentry Peak Trail to the North Sentry aid station, then descends to the shoreline, follows old ranch roads to the Split Rock switchbacks, climbs past Elephant Head, continues on White Rock Trail to the White Rock trailhead, and returns via a dirt road and the Mountain View Trail.
Aid stations and support: Lower Frary (~6 miles), Ranch (~11.7 miles; only drop bag location on course), North Sentry (~15.5 miles; ~1,000 ft climb), Elephant Head (~24 miles), White Rock Bay (~29 miles), and the start/finish. The 50K has a 10-hour time limit and is hand timed. Two drop bag locations are provided (start/finish and Ranch). Dogs are allowed on leash. Camping is available via the state park reservation system. race rules include no littering, no course cutting, no pacers, and no outside aid. Awards include a finisher mug and trophies/spending money for top finishers. Visit the organization's website for the most recent information.