The larger Palisades Fire, which has consumed 95sq km on the west side of Los Angeles, was also now 100 per cent contained, the California Department of Forestry and Fire Protection (Cal Fire) said.
The two major fires plus several smaller ones created the worst natural disaster in Los Angeles County history, killing 28 people and damaging or destroying more than 16,000 structures, Cal Fire said.
At one point, 180,000 people were under evacuation orders, according to Los Angeles County officials.
The damage and economic losses of the wildfires could top $A401 billion, AccuWeather says. (AP PHOTO)
Private forecaster AccuWeather projects damage and economic losses of more than $US250 billion ($A401 billion).
Containment measures the percentage of a fire's perimeter that firefighters have under control, with confidence that those lines can be maintained.
Parts of the fire's interior could still be burning.
Long overdue rain reached Southern California in the past week, helping firefighters contain the fires while also increasing the danger of flash floods and mudslides in the denuded hills and the spread of toxic material left in the fire's devastation.
Firefighters say 100 per cent containment is largely symbolic at this point as the last remaining fires were isolated in steep mountain terrain.
"It's more important when we say forward progress is stopped," Los Angeles Fire Department spokeswoman Margaret Stewart said.
Forward progress was halted about a week after the two major fires started on January 7.
The rain was "more of a hindrance", Stewart said, because it caused mudslides and blocked roads used by responders.
"Had this rain come two weeks ago, it might have been more helpful," she said.
