A female occupant of a home on property at 655 Hunter Lane, between Santa Rosa and Rohnert Park, reported the fire at 9:40 p.m., Lantz said. The main house on the property was not threatened by the blaze, Lantz said.
The fire also burned vegetation but was controlled within an hour, Lantz said.
Twenty-six firefighters from Central Fire, Santa Rosa, Rincon Valley, Rohnert Park and Rancho Adobe responded to the blaze, which started in the 300-square-foot shed, Lantz said.
The cause of the fire is under investigation.
The Central Fire Authority of Sonoma County serves the communities of Bellevue, Larkfield/Wikiup, Rincon Valley and Windsor.