|Location||Glenn County, west of Willows, California, United States|
|Address||5250 Highway 162|
|Major events|| Trans-Am Series |
National Auto Sport Association
25 Hours of Thunderhill
Thunderhill Raceway Park is a motorsports complex located 7 miles 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.
Thunderhill has two tracks: the original 3-mile track known as Thunderhill East and a 2-mile track known as Thunderhill West. The two tracks can also be combined to offer a 5-mile track, the longest road course in America. Thunderhill also offers two large skid pad areas as well for drifting and car control events.
The venue is available for a wide variety of events or functions. It can be rented for racing events, lapping day events, drifting events, go kart events, driving schools, ride and drive programs, corporate events, commercials, a movie location, trade shows, weddings, receptions, swap meets etc.
San Francisco Region Properties, Inc., dba Thunderhill Park is the wholly-owned subsidiary of the San Francisco Region Sports Car Club of America. Thunderhill Raceway has its own board of directors and is operated completely independently of the non-profit subsidiary.
Thunderhill Raceway Park was built in 1993 originally as a 1.9-mile, 9-turn track. Following the closure of the Baylands Raceway in Fremont, CA, the purchase of the land and construction of Thunderhill was funded by the San Francisco Region Sports Car Club of America.
In late 1997, the track was expanded to its present-day 3-mile configuration, adding six new turns, a bypass for the "cyclone" corner, and additional paved paddock space.
Thunderhill West was conceptualized in 2013 and built in 2014 as a standalone track. Connectors were made to connect the original track with the new west track to make a five-mile-long track. At the time of construction, this was the longest racetrack in California, and it gained the nickname "Thunderschleife" as a nod to the Nurburgring Nordschleife.
Sonoma Raceway is a road course and dragstrip located at Sears Point in the southern Sonoma Mountains of Sonoma County, California. The road course features 12 turns on a hilly course with 160 ft (49 m) of total elevation change. It is host to one of the few NASCAR Cup Series races each year that are run on road courses. It has also played host to the IndyCar Series, the NHRA Camping World Drag Racing Series, and several other auto races and motorcycle races such as the American Federation of Motorcyclists series. Sonoma Raceway continues to host amateur, or club racing events with some open to the public. The largest such car club is the Sports Car Club of America. The track is 30 mi (48 km) north of San Francisco and Oakland.
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Altamont Raceway Park is a motorsports race track in the western United States, located in northern California, west of Tracy. It opened on July 22, 1966, and operated under the names Altamont Speedway, Altamont Raceway, Altamont Motorsports Park, Altamont Raceway Park and Arena, and Bernal Memorial Raceway. After 42 years of operation, the speedway closed in October 2008; the site is just south of the junction of Interstates 205 and 580.
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Carl Rydquist is a Swedish-American FIA Silver and Trans-Am racing driver and a SAG-AFTRA licensed stunt and precision driver who has won many auto races and racing championships. Rydquist gained notoriety for his speed in 2001 when he beat more than 1100 enthusiasts and professional racedrivers in a gocart challenge created by Eurosport to promote their Super Racing Weekend FIA GT and ETCC sports coverage. The event propelled him to his first GT Endurance ride with Apex Racing's Porsche. Rydquist actively competes in racing and has competed in professional drifting. In Rydquist's auto racing career, he currently has a victory in more than one third of his races and podium finishes in three out of four Touring and GT car endurance and sprint races.
GRIDLIFE is a motorsports sanctioning body that hosts a series of music and motorsports festivals at racetracks across the United States. Racetrack venues that currently host Gridlife festivals include Carolina Motorsports Park, Watkins Glen International, GingerMan Raceway, Mid-Ohio Sports Car Course, Lime Rock Park, and WeatherTech Raceway Laguna Seca. Non-festival events are held at Autobahn Country Club, Road America, Heartland Motorsports Park, New Jersey Motorsports Park & more. GRIDLIFE events feature daytime events such as road racing, time attack, drifting, car shows and concerts with contemporary EDM, Hip Hop and Alternative music in the evenings.
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.
Jeff Shafer is a former racing driver. Shafer competed in USF2000, Atlantic Championship among other series.
Roger Eagleton is an American race car driver and entrepreneur, born in Glendale, California. He is currently based in Waikiki, Honolulu and is the 2019 Trans-Am West Coast Champion in the GT Class.
Mason Filippi is an American auto racing driver who competes in the TCR class of the Michelin Pilot Challenge for Bryan Herta Autosport. He previously raced for Bryan Herta Autosport, finishing the Michelin Pilot Challenge in second place in 2019 and third in 2020. Filippi also piloted touring cars in the TC America Series and the Pirelli World Challenge from 2017 to 2019, finishing in the top five of the standings each season. Prior to racing touring cars, he drove Spec Miatas, competing in the Global MX-5 Cup and the Teen Mazda Challenge and winning the 25 Hours of Thunderhill race in 2015 and 2016.