Nybro Backyard 12h is a 12-hour, backyard-style running race held in Svartbäcksmåla, Nybro. The race base is at Nybro Ski Club's facility, located near the exercise trails. Runners begin together at 08:00, and the event concludes at 20:00. The core challenge is determining how many hourly laps one can complete within the timeframe. Each lap covers 6.706 kilometers, with a maximum of 12 laps possible, totaling just over 80 kilometers.
A new lap commences on the hour. Participants who finish a loop within the allotted time may start the subsequent one. This structure offers a straightforward approach for novice backyard runners to engage with the format, while seasoned participants can aim to complete all available laps. Topp & Dröm HB organizes the race as part of its annual competition schedule in Nybro. The event has a participant limit of 200 and prioritizes endurance, focus, community, and time spent outdoors.