Thunderhill Raceway Park, motorsports complex in Sacramento Valley, California, U.S
Thunderhill Raceway Park is a motorsport racing track in Glenn County, northern California, roughly two hours north of Sacramento, set among open hills and dry grassland. The facility has several track layouts that can be used for different vehicle classes and racing disciplines.
The track was built in the 1990s, originally intended as a training ground for motorsport fans in northern California. Over time it grew into a regional competition venue that draws drivers from across the state.
The name "Thunderhill" reflects the rolling hills that surround the track in the Sacramento Valley. On race days, the crowd is a mix of serious amateur drivers and professional teams, giving the place a working, no-frills feel rather than that of a polished spectator venue.
The track is fully outdoors, so visiting on a dry day is a good idea, especially in spring and fall when temperatures are comfortable. Public access is generally limited to scheduled event days, so it is worth checking the event calendar in advance.
One of the track configurations stretches to about 5 miles (8 km), making it one of the longest permanent road courses in the US. This length allows endurance races to take place that would not be possible on shorter circuits.
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