The 2018 Gander Outdoors 400 was a Monster Energy NASCAR Cup Series race held on October 7, 2018 at Dover International Speedway in Dover, Delaware. Contested over 404 laps—extended from 400 laps due to an overtime finish, on the one-mile (1.6 km) concrete speedway, it was the 30th race of the 2018 Monster Energy NASCAR Cup Series season, fourth race of the Playoffs, and the first race of the Round of 12.