SoCal has:
Buttonwillow
Willow Springs
Streets of Willow
Auto Club Speedway
Chuckwalla Valley Raceway
Thermal (private club though)
all within about 3 hours. If you extend it out to 4-5 hours, you could also include:
Spring Mountain
Las Vegas Motor Speedway
Likely whatever tracks are in the west side of Arizona as well.
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