The Westwood Fire was burning on the northern edge of the city just west of Chivo Canyon.
The Ventura County Fire Department sent two helicopters and two air tankers in addition to engines on the ground.
There were no evacuations in place point and no injuries were reported.
By around 6:40 p.m. the Ventura County Fire Department reported forward progress was stopped and the fire was 90% contained. Firefighters were remaining on the scene overnight mopping up and securing the line.
The cause of the fire remains under investigation.