For years, it has joined a larger racing community in Southern California, where fans have seen the loss beloved tracks. The Ontario Motor Speedway opened in August 1970, at a cost of $25.5 million.

Hold those lighters aloft in remembrance: Fifty years ago, 200,000 rock fans descended on Ontario Motor Speedway for California Jam, a one-day music festival. The April 6, 1974 event — ticket ...

200,000 rock fans descended on Ontario for California Jam, a one-day music festival on the grounds of the Ontario Motor Speedway. The April 6, 1974 event — ticket price: $10 — had this concert ...

Fans of auto racing across Southern California have a chance on Saturday ... namely Riverside International Raceway and Ontario Motor Speedway. The track was a mainstay in the NASCAR racing ...