The fire prompted evacuations as it moved uphill after originating along North Fairplex Drive near the 10 Freeway shortly before 3 p.m., according to L.A. County fire officials.
Using a water-dropping helicopter and a dozen engines, firefighters were able to slow its forward progress around 3:45 p.m. and reached 70 percent containment around 9 p.m.
No structures were threatened, per L.A. County fire officials.
The cause of the fire was not immediately known.
The City News Service contributed to this report.