Willow Springs International Motorsports Park is located in Willow Springs near Rosamond, California, about 80 mi (130 km) north of Los Angeles. It is the oldest permanent road course in the United States. Construction began in 1952, with the inaugural race held on November 23, 1953. The main track is a 2.500 mi (4.023 km) long road course that is unchanged from its original 1953 configuration. The elevation changes and high average speeds make it a favorite of many road racing drivers.

Rosamond is an unincorporated community in Kern County, California, US, near the Los Angeles county line. Rosamond is part of Greater Los Angeles and is located in the Mojave Desert just north of Lancaster and Palmdale, two of the largest cities in Antelope Valley. As of the 2010 Census, Rosamond's population was 18,150. For statistical purposes, the United States Census Bureau has defined Rosamond as a census-designated place (CDP).