Fieri's bright yellow Gallardo was taken on Tuesday.
Investigators told the San Francisco Chronicle that a thief climbed to the roof of the exotic car dealership then rappelled into the showroom using climbing gear.
The thief reportedly left behind a bag of mountaineering gear.
Fieri, who lives in Santa Rosa, hosts Food Network's "Diners, Drive-ins and Dives."
The Associated Press contributed to this report.