Fall Creek Beast
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About the race
The Fall Creek Beast is a trail running event in Swan Valley, Idaho, held on the morning of October 31, 2026. The course is centered on Fall Creek Road at Rainbow Valley Ranch and is described as a mountain trail setting near the Snake River valley. The location is about 35 minutes from Idaho Falls, 45 minutes from Rexburg, and one hour from Jackson Hole.
Distances offered
- 50K with 6,000 ft gain
- Half marathon (13.1 miles) with 2,700 ft gain
Published entry prices list the Half Marathon at $59 and the 50K at $99. Organizers emphasize community aspects of trail running, noting shared starts, aid station interactions, and postrace camaraderie. The event name and theme reference a local 1868 folklore creature from Swan Valley, described in historical accounts as an aquatic, snake-like monster with rainbow scales and an elephant-like trunk; the race is named for that creature.
The 2025 edition sold out, and organizers note limited space for 2026. The event is presented as an in-person trail running competition focused on mountain terrain and elevation gain. Visit the organization's website for the most recent information.