Nordansjö Nattultra is a July night ultra held in Nordansjö, near Norberg, Sweden. The primary event covers 60 km, run entirely after dark. Norbergs OK organizes the race, which begins and ends at their club cabin in Nordansjö. Two shorter races are also featured: Tjuvstarten by Ullmax, spanning 12 km, and Mini-Ultra, a 1.5 km distance. As this race series is in its second year, it presents itself as a challenge built by a local club rather than a long-standing event.
The 60 km course consists of five loops, intended to simplify distance management for both participants and their support crews compared to a single point-to-point route. Organizers characterize the paths as straightforward and suitable for a broad spectrum of runners, from seasoned ultrarunners to individuals attempting a longer summer race for the first time. Tjuvstarten by Ullmax is included in the Södra Svealands Löparserie. The main 60 km race introduces a competitive element with a Bergspris, awarded to the first runner reaching the summit of Håberget.