The fire burned a large barn filled with antiques along with a nearby motor home and a number of cars.
Fire officials say it's possible strong winds in the area caused a power line to go down or caused the lines to arc, hitting the barn and sparking the fire.
There are no hydrants in the area, so mobile water trucks from Santa Rosa, Rohnert Park and Rincon Valley were called in.
Aside from the wind, firefighters say they faced a number of hazards, including stored cars, outbuildings, dry grass and propane tanks. Three nearby homes were evacuated, but nobody was hurt.
An investigation has been launched into the case of the blaze.