The so-called Mountain Fire was reported shortly before 7:30 p.m. near East Mountain Street, just south of Glendale Community College.
No evacuations, structural damage or injuries were immediately reported.
Several of the 2 Freeway's southbound lanes were shut down as fire engines responded to the scene and firefighters hiked up the hillside to attack the flames.
The fire was knocked down shortly after 8 p.m.
The cause of the fire was unknown.