Altamont Raceway Park is a motorsports race track in the western United States, located in northern California, west of Tracy.

The park is well known for its December 6, 1969, hosting of the notorious and ill-fated Altamont Free Concert, featuring Santana, Jefferson Airplane, The Flying Burrito Brothers, Crosby, Stills, Nash & Young, and The Rolling Stones.

During the Stones' set, Meredith Hunter, a concert-goer high on methamphetamine and brandishing his revolver, was stabbed to death by a member of the Hells Angels, which had been hired to provide security, in front of the stage as the band played.

The park also played host to a race on the NASCAR Camping World West Series schedule, the Dan Gamel RV Centers 200 in the fall.

However, in the place of top dollar racing machines, the 24 Hours of LeMons features cars with a maximum price of $500 (excluding safety gear, brakes and tires), hence the title 'lemons'.