Update: County Fire grows to 15 acres in Yolo County, now 90% contained

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Updated: 4:59 p.m. May 17

First discovered: 3 hours ago, 1:25 p.m. May 17

Initial location: County Road 2 and County Road 84, west of Dunnigan, Calif.

Fire unit: Cal Fire Sonoma-Lake-Napa Unit

Fire type: Wildfire

Fire name: County Fire

County Fire initially started today at 1:25 p.m. at County Road 2 and County Road 84, west of Dunnigan in Yolo County, California.

After being active for three hours, it has burned 15 acres. By Sunday afternoon, the fire crew managed to contain 90% of this wildfire. However, the cause is still under investigation.

Among other resources, two engines have also been deployed to fight the wildfire. According to Cal Fire, "Numerous firefighting air tankers from throughout the State are flying fire suppression missions as conditions allow."

Fire containment

Interpreting what 90% containment means

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 90% of the wildfire is contained from spreading, while 10% 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 May 17, 2026 at 2:18 PM.