The fire charred nearly 22 square miles of brush in the Antelope Valley. It was 87 percent contained Sunday, and crews hoped to have it fully surrounded by Monday evening, Los Angeles County Inspector Don Kunitomi said.
All roads were reopened at sunrise Sunday.
The fire was believed to have been sparked Thursday afternoon in the Agua Dulce area by someone working on a car wheel.
Four homes and five outbuildings were destroyed.
Los Angeles County Fire crews are also on the scene Sunday of a smoky wildfire burning near the 101 Freeway in Calabasas.
The 12-acre brush fire broke out on vacant land near the Calabasas City Hall just before noon.
CBS Station KCBS reports the fire burned 8 acres of brush within 15 minutes, prompting a second alarm to be called at 12:14 p.m.
Authorities shut down Mureau Road between Mountain View Drive and its overpass about the 101 Freeway at Calabasas Road. In addition, two lanes of the four westbound freeway lanes have been blocked by fire trucks.
As of 12:30 p.m. local time, no evacuations have been ordered by deputies, a spokeswoman at the Malibu-Lost Hills sheriff's station said.
A large plume of smoke was visible from the San Fernando Valley.
The Calabasas fire broke out at the same time that Los Angeles city firefighters rushed to a separate brushfire just north of the Reagan Freeway at Topanga Canyon Boulevard's north end , in Chatsworth.
To the south in rural San Diego County, a wildfire sparked Saturday that has burned about 110 acres of heavy brush near Julian was nearly surrounded.