Firefighters responded to flames at about 3:45 p.m. north of Magic Mountain Parkway and east of 5 Freeway. Three helicopters could be seen making drops of water.
By about 4:25 p.m., firefighters were hiking in to put out the remaining flames.
Winds were blowing at 5 to 10 miles per an hour. By about 6:30 p.m., the fire was about 80 percent contained, Los Angeles County firefighters reported.
The cause has not been determined and no arrests have been made, Los Angeles County sheriff's officials said.
No injuries or evacuations were immediately reported.