[2] ARX's inaugural race was held in May at Silverstone Circuit as a support to the World RX of Great Britain; Tanner Foust won the event.

[3] The first American round took place in July at Circuit of the Americas, won by Scott Speed.

[4] Speed ended the 2018 season as the champion, his fourth consecutive title in a rallycross series.

[5] The series also hosted the ARX2 class, a second-tier league with spec Ford Fiestas.

[7] On November 15, 2019, IMG announced the series would fold after just two seasons following a failed search for commercial partners.