Update: Containment progress - Summit Fire in Los Angeles County at 39%

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Updated: 8:05 a.m. July 13

First discovered: 3 days ago, 1:29 p.m. July 10

Initial location: Jesus Canyon Road East and Avenue Z, Llano, Los Angeles County, Calif.

Fire unit: Unified Command: Cal Fire, LA County Fire Department, and USFS Angeles National Forest

Fire type: Wildfire

Fire name: Summit Fire

Summit Fire initially started 1:29 p.m. July 10 at Jesus Canyon Road East and Avenue Z, Llano in Los Angeles County, California.

As of Monday morning, it had swept through 2,690 acres. By Monday morning, 39% of the fire was brought under containment. At present, details about the cause of the fire are unknown.

Fire containment

What does it mean for a fire to be 39% contained?

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 39% of the wildfire is halted from spreading, while 61% is still uncontrolled.

Containment is part of a larger plan for managing a wildfire. It is normally expressed as a percentage and it refers to how much of the fire perimeter has been surrounded/enclosed by a control line that firefighters create. The containment percentage indicates a certain level of control, but it doesn't always correlate to safety level. Also, it's important to note that containment doesn't mean a fire is out.

How is containment measured?

The incident's central command constantly receives progress reports from firefighters on the ground. As the fireline is constructed, inspected or reinforced, mappers record those details to adjust the containment percentage. The percentage tells the public how much of the fire perimeter is believed to not go beyond the control lines.

Source: Cal Fire

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This story was originally published July 13, 2026 at 8:22 AM.