The Oak Fire was a wildfire that burned north of Brooktrails in Mendocino County, California in the United States. The fire was first reported on September 7, 2020 and was contained on September 14, 2020. It burned 1,100 acres (445 ha). The fire resulted in the evacuation of over 3,200 people just north of the city of Willits. It damaged 1 and destroyed 56 structures. The cause of the fire remains under investigation.