NASCAR has been racing at Sonoma Raceway since 1989 when Ricky Rudd won the inaugural race in wine country but the track had been open since 1968 and featured several different series before NASCAR came to town.
Check out these historical facts about Sonoma:
At most NASCAR tracks, the only talk about elevation change is how much banking is in the corners. The road course at Sonoma Raceway features a much different type of elevation change. At its highest point on the track (Turn 3a), drivers are 174 feet above sea level and drop down to 14 feet above sea level in Turn 10.