The 2018 U.S. Cellular 250 presented by The Rasmussen Group was the 19th stock car race of the 2018 NASCAR Xfinity Series season, and the 10th iteration of the event. The race was held on Saturday, July 28, 2018, in Newton, Iowa at Iowa Speedway, a 7⁄8 mile (1.4 km) permanent D-shaped oval racetrack. The race was extended from its scheduled 250 laps to 257 due to a NASCAR overtime finish. At race's end, Christopher Bell of Joe Gibbs Racing would battle and hold off JR Motorsports driver Justin Allgaier in an overtime restart to win his fifth career NASCAR Xfinity Series win, his fourth of the season, and his third consecutive win in the series, a feat that was last accomplished by Dale Earnhardt Jr. in 2018. To fill out the podium, Kyle Benjamin of Joe Gibbs Racing would finish third.