The Ranch Fire, burning west of Red Bluff in Tehama County, is now mostly contained despite injuring another person, Cal Fire said.
In a Sunday afternoon update, Cal Fire reported that the wildfire was 80 percent contained, up from 32 percent Thursday.
Since starting last week, the Ranch Fire has injured four people, but has not killed anyone or damaged any buildings. The cause of the fire is still under investigation.
Firefighters reduced the size of the blaze from 3,768 acres down to 2,534 acres as of Sunday. More than 600 personnel remain on the scene.
“Firefighters continue to hold existing containment lines, mop up and patrol,” Cal Fire said in an incident report. “Crews backhauled hose from the fire line and fire suppression repair remains ongoing.”