36th To Bone and Back 40-Mile Ultra Marathon

36th To Bone and Back 40-Mile Ultra Marathon is a 64.4 km ultramarathon in Idaho Falls, ID, United States, taking place on Jun 27, 2026. This edition has already taken place.

Date: Jun 27, 2026
Distance: 64.4 km
Location: Idaho Falls, ID, United States
Format: Fixed distance

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