Iron Backbone Ultra begins and ends at Hultets friluftsgård in Kristinehamn. Runners venture into the dark on trails constructed around Järnleden. Three distances are available: 15 km, 30 km, and 50 km, suitable for a first trail race or a longer night run for seasoned participants.
The course crosses deep forest, boggy terrain, small lakes, pastures, and old paths, with Järnleden forming the race's primary axis. The 15 km route deviates partially from this trail, giving the shortest option a distinct layout. Topp & Dröm organizes the event, welcoming participants who aim to finish and those competing at the front.