Police investigators tell the San Francisco Chronicle a thief climbed to the roof of the dealership then rappelled into the showroom.
The garage door lock was cut and the Lamborghini was driven away.
The car is worth more than $200,000.
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."
