Winds were calm Monday morning and the temperatures dropped, helping firefighters working to contain the blaze. The fire was 20 percent contained Sunday night.
Firefighters have been able to prevent flames from reaching any homes or structures. The fire is burning through thick brush and has consumed just over 250 acres in the forest, west of Lancaster.
More than a half dozen helicopters and 200 helicopters attacked the flames Sunday.
There was concern of flames reaching homes near Green Valley, but shifting winds pushed the fire upward and away from structures.
San Francisquito Canyon Road has been shut down north of Santa Clarita and all the way to Green Valley.
Authorities said they have no idea what caused the fire.