Fall Creek Beast
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Fall Creek Beast : 50K and Half Marathon
The Fall Creek Beast is a trail race in Swan Valley, Idaho held on October 31, 2026, on Fall Creek Road near Rainbow Valley Ranch. The event offers two distances on natural terrain through sage, meadows, ridges, and singletrack typical of the valley.
The course options and elevation gains are:
- 50K : 6,000 ft gain on Fall Creek Road and adjacent trails
- Half marathon : 13.1 miles, 2,700 ft gain on mixed trail and dirt roads
The event location is described as approximately 35 minutes from Idaho Falls, 45 minutes from Rexburg, and about 1 hour from Jackson Hole. Organizers emphasize community aspects of trail running, noting a focus on shared experience at aid stations and postrace gatherings. Entry fees are presented as roughly half what a typical race charges, reflecting an intention to lower cost barriers.
The race name refers to local folklore from 1868 about a Swan Valley creature described as an aquatic, fire-breathing, snake-like cryptid. The description of that legend appears as part of the event identity and explains the event title. Visit the organization's website for the most recent information.
