The 2017 Service King 300 was the fifth stock car race of the 2017 NASCAR Xfinity Series season and the 19th iteration of the event. The race was held on Saturday, March 25, 2017, in Fontana, California, at Auto Club Speedway, a 2 miles (3.2 km) permanent D-shaped oval racetrack. The race took the scheduled 150 laps to complete. At race's end, Kyle Larson, driving for Chip Ganassi Racing, would defend against eventual second-place finisher, Team Penske driver Joey Logano, on the final restart with four to go to win his sixth career NASCAR Xfinity Series win and his first of the season. To fill out the podium, Kyle Busch of Joe Gibbs Racing finished third.