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Thunderhill Raceway Park is a motorsports complex located 7 mi (11 km) west of Willows, California, United States, in the Sacramento Valley.It is the venue for the longest automobile race in the United States, the 25 Hours of Thunderhill, held annually during the first weekend in December.
The 25 Hours of Thunderhill is an endurance racing event held annually during the first weekend in December in Northern California, at the Thunderhill Raceway Park; just outside the small city of Willows. The race is longest road event on a closed course in the United States.
Sonoma Raceway, Sonoma: September 12–14 NASA Northern California Region Formula Car Challenge: R8 5 R9 Thunderhill Raceway Park, Willows: October 24–26 San Francisco Region SCCA Series Formula Car Challenge: R10 6 R11 Buttonwillow Raceway Park, Buttonwillow: November 14–16 California Sports Car Club Formula Car Challenge: R12
Sonoma Raceway, Sonoma: September 13–14 NASA Northern California Region Formula Pro USA Western Championship: R12 7 R13 Thunderhill Raceway Park, Willows: October 24–26 San Francisco Region SCCA Series Formula Pro USA Western Championship: R14 8 R15 Buttonwillow Raceway Park, Buttonwillow: November 14–16 Pacific F2000 Championship
Sonoma Raceway, Sonoma: 31 August San Francisco Region SCCA Series Formula Pro USA Western Championship: R12 1 September 7 R13 Thunderhill Raceway Park, Willows: 25 October San Francisco Region SCCA Series: R14 26 October 8 R15 Buttonwillow Raceway Park, Buttonwillow: 16 November California Sports Car Club Formula Pro USA Western Championship ...
Orange County International Raceway; California State Fairgrounds Race Track; ... Thunderhill Raceway Park; V. Ventura Raceway; Veterans Memorial Stadium (Long Beach) W.
Thunderhill Raceway Park, Willows: 15 April Formula Pro USA Western Championship San Francisco Region SCCA Series: 4 16 April 5 Buttonwillow Raceway Park, Buttonwillow: 29 April Formula Pro USA Western Championship California Sports Car Club: 6 30 April 7 Thunderhill Raceway Park, Willows: 3 June Formula Pro USA Western Championship
Thunderhill Raceway Park: Willows: California: 1994 Asphalt 3.0 miles (4.8 km) 15 SCCA, 25 Hours of Thunderhill, Trans Am Series: Utah Motorsports Campus (formerly Miller Motorsports Park) Tooele: Utah: 2005 Asphalt 4.486 miles (7.220 km) 23 SCCA, World Superbike, AMA, Lucas Oil Off Road Racing Series, MotoAmerica, NASA, ChampCar Endurance Series