2018 NASCAR Xfinity Series

William Byron won the 2017 championship with JR Motorsports, but moved up to the Monster Energy NASCAR Cup Series.

9 JR Motorsports Chevrolet Camaro SS, won the drivers' championship.

Both drivers did qualify for the postseason but did not advance to the last round of the playoffs as they had done the past two years.

[1] Justin Allgaier clinched the NXS Regular Season Championship trophy after the 2018 DC Solar 300 at Las Vegas Motor Speedway.

[3] It was also the final season of Dodge as a manufacturer, as the new flange-fit composite body rules have made the former Team Penske Challengers (nicknamed "Zombie Dodges" due to their lack of factory support since 2013) used by smaller teams ineligible due to their welded steel bodies.

Furthermore, the Lilly Diabetes 250 at Indianapolis Motor Speedway will move from July to September.

The Drive for the Cure 200 will also utilize Charlotte Motor Speedway's 2.28-mile (3.67 km) road course instead of its oval.

[9][19] On August 25, NASCAR announced the tracks that will compose the Dash 4 Cash incentive program: The four Dash 4 Cash races will be run consecutively on the overall series schedule, starting at Bristol Motor Speedway on April 14.

Italics – Pole position set by final practice results or owner's points.

Tyler Reddick , the 2018 Xfinity Series champion as well as the Rookie of the Year .
Cole Custer finished second behind Reddick in the championship.
Daniel Hemric finished third in the championship.
Christopher Bell , the defending Truck Series champion, who moved up to the Xfinity Series full-time in 2018, finished fourth in the championship.
Justin Allgaier , the regular season champion, finished seventh in the championship.
Chevy won the manufacturer's championship.
2018 was the final year with Dodge participation. For the season finale, Carl Long placed a tribute decal on his "Zombie Dodge" car.
The OneMain Financial 200 at Dover International Speedway in May
The Pocono Green 250 at Pocono Raceway in June
The Drive for the Cure 200 at Charlotte Motor Speedway in September
The Bar Harbor 200 at Dover International Speedway in October