Update: Ledson Fire in Sonoma County - containment reaches 35%

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Updated: 9:51 p.m. July 13

First discovered: 8 hours ago, 1:02 p.m. July 13

Initial location: Sonoma Highway (HWY 12) and N Pythian Rd, Santa Rosa, Sonoma County, Calif.

Fire unit: Cal Fire Sonoma-Lake-Napa Unit

Fire type: Wildfire

Fire name: Ledson Fire

Ledson Fire initially started today at 1:02 p.m. at Sonoma Highway (HWY 12) and N Pythian Rd, Santa Rosa in Sonoma County, California.

As of Monday evening, 16.5 acres of land had been destroyed by it. By Monday evening, the fire crew succeeded in containing 35% of the fire. There is currently no information on the cause of the fire.

Fire containment

Understanding what 35% containment means

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 35% of the wildfire is halted from spreading, while 65% 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 2:39 PM.