The1966 USAC Championship Car season consisted of 16 races, beginning inAvondale,Arizona on March 20 and concluding at the same location on November 20. There was also one non-championship event atFuji Speedway inJapan. TheUSAC National Champion wasMario Andretti, and theIndianapolis 500 winner wasGraham Hill. AtIndianapolis,Chuck Rodee was killed while qualifying for the1966 Indianapolis 500. Also of note was the end of the career of two-time 500 and two-time National ChampionRodger Ward as he ran the final three races of his IndyCar career at the start of the season which included the final IndyCar victory of his career at Trenton.
^A No pole is awarded for the Pikes Peak Hill Climb, in this schedule on the pole is the driver who started first. No lap led was awarded for the Pikes Peak Hill Climb, however, a lap was awarded to the drivers that completed the climb.