Entry openRace day · see schedule
50K (6,000 ft gain)
Distance50K
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Trail running · Swan Valley, Idaho
Fall Creek Beast 2026.
Overview
About the race.
Fall Creek Beast is a Halloween trail race in Swan Valley, Idaho, about 35 minutes from Idaho Falls, 45 from Rexburg and an hour from Jackson Hole. Runners choose a 50K with about 6,000 ft of gain or a half marathon with about 2,700 ft, with starts at 6 AM and 9 AM on October 31, 2026. It is named for the Swan Valley Monster of 1868 Idaho folklore. Registration is on UltraSignup.
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