25 Hours of Thunderhill

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 town of Willows.

It has been run since 2003,[1] sanctioned by the National Auto Sport Association.[2]

It is the successor to the Timex 12 Hours of Thunderhill event run between 1998 and 2002.[3]

The longest "closed course" road race in the U.S.A.

References

"25 Hours of Thunderhill – Past Results". nasa25hour.com. Retrieved 22 February 2017.
"Davidson Racing Norma wins the 25 Hours of Thunderhill". Motorsport.com. 2014-12-07. Retrieved 22 February 2017.
"History of the 25 Hours of Thunderhill" (PDF). NASA 25 HOURS OF THUNDERHILL. nasa25hour.com. Retrieved 22 February 2017.

Automobile endurance races
24 hours	24 Hours of Le Mans 24 Hours of Daytona 24 Hours Nürburgring Spa 24 Hours Dubai 24 Hour 24 Hours of Chamonix Fuji 24 Hours Longest Day of Nelson 24 Hours of Zolder 24H Silverstone – European Touring Car Edition Willhire 24 Hour Bathurst 24 Hour 2CV 24 Hour Race Tokachi 24 Hours Barcelona 24 Hour Fermín Vélez Trophy
12 hours	12 Hours of Sebring Bathurst 12 Hour Sepang 12 Hours 12 Hours at the Point 12 Hours of Reims Rothmans 12 hours 12 Hours of Brno
7-11 hours	Petit Le Mans (10 hours) Suzuka 10 Hours Kyalami 9 Hours California 8 Hours
6 hours	6 Hours of Spa-Francorchamps 6 Hours of Silverstone 6 Hours of Nürburgring Lone Star Le Mans 6 Hours of Mexico 6 Hours of São Paulo 6 Hours of Bahrain 6 Hours of Shanghai 6 Hours of Fuji 6 Hours of Watkins Glen LA Times GP 6 Hour Le Mans 6 Hours of Atlanta Bathurst 6 Hour 6 Hours of Castellet 6 Hours of Donington 6 Hours of Estoril 6 Hours of Imola Mid-Ohio 6 Hours Monterey 6 Hours Mosport 6 Hours 6 Hours of Vallelunga 6 Hours of Zhuhai
1000 miles	Mille Miglia Mil Milhas Brasil 1000 Miles of Sebring
1000 km	Bathurst 1000 1000 km Algarve Baja 1000 1000 km Brands Hatch 1000 km Buenos Aires 1000 km Catalunya Fuji 1000 km 1000 km Istanbul 1000 km Jarama 1000 km Le Mans (Bugatti) 1000 km Monza 1000 km Mosport 1000 km Okayama 1000 km Paris Sepang 1000 km 1000 km Zeltweg Race of a Thousand Years
Other	Carrera Panamericana Targa Florio TCR Spa 500 Laps or 23 Hours 25 Hours of Spa Charge of the Headlight Brigade 25 Hours of Thunderhill
Defunct races are indicated in italics

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