2015B NASA RallyCross Challenge Season

The 2015B NASA RallyCross Challenge season was the tenth season of the championship. Josh Mertz successfully defended his championship after the season was called with four races completed. The German paired with long time friend and rival Dylan Livengood to form Aftershock Motorsports, which won the Constructors' Championship in its first season of competition.

Calendar Changes

 * The NASA Proving Grounds have been removed after a single season reboot of the race.
 * The newly renamed Area52 Designs Endurance Cup has returned.
 * Talladega, Bent Twig, Riverside, and Irwindale all return. Talladega was not featured at all in 2015A, along with Bent Twig. The latter two were cut when the season ended early.

Team and Driver Changes

 * Josh Mertz and Dylan Livengood leave their respective teams of MRT and Revolution Racing to form their own team, Aftershock Motorsports.
 * Cody Erdmann left MRT to re-open Area 52 Racing.
 * Tanner Smith left Revolution Racing to partner up with the returning Brandon Lambert.
 * As a result, Dylan Smith left MRT to join Revolution Racing in Tanner's absence.
 * MRT subsequently signed Steve Rada and Tim Johnston.
 * Dunn LaPradd Incorporated becomes a Constructor team, with Dunn LaPradd and Brandon Nicholson driving.
 * Tristan Hagenstein will return to MRT as a part-time driver, moving Steve Rada to MRT Junior when Hagenstein races.

2015A Drivers' Championship
Points are awarded to the top 16 finishers.

2015B Manufacturers' Championship
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