25 Hours of Thunderhill

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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.

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]

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References

  1. "25 Hours of Thunderhill – Past Results". nasa25hour.com. Retrieved 22 February 2017.
  2. "Davidson Racing Norma wins the 25 Hours of Thunderhill". Motorsport.com. 2014-12-07. Retrieved 22 February 2017.
  3. "History of the 25 Hours of Thunderhill" (PDF). NASA 25 HOURS OF THUNDERHILL. nasa25hour.com. Retrieved 22 February 2017.