Update: Border 6 Fire grows to 1,000 acres in San Diego County, now 5% contained

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Updated: 7:06 a.m. June 3

First discovered: 41 hours ago, 1:54 p.m. June 1

Initial location: Tijuana River, Marron Valley, San Diego County, Calif.

Fire unit: Cal Fire San Diego Unit

Fire type: Wildfire

Fire name: Border 6 Fire

Border 6 Fire initially started 1:54 p.m. June 1 in Tijuana River, Marron Valley in San Diego County, California.

Since its discovery 41 hours ago, it has burned 1,000 acres, an increase of 300 acres since the last update. As of Wednesday morning, a fire crew of 130 effectively contained 5% of the fire. The cause of it is still under investigation.

Firefighting efforts include 10 engines, four water tenders, four helicopters and four hand crews. According to Cal Fire, "Numerous firefighting air tankers from throughout the State are flying fire suppression missions as conditions allow."

Evacuation information from Cal Fire

Evacuation Warnings

Potential threat to life and/or property. Those who require additional time to evacuate, and those with pets and livestock should leave now.

Evacuation Warnings have been issued for the following zones:

SDC-2544

SDC-2545

SDC-2605

SDC-2643

SDC-2644

SDC-2645

See live video from the area:

Https://cameras.alertcalifornia.org/?id=Axis-Otay2

Fire containment

What does 5% containment mean?

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 5% of the wildfire is halted from spreading, while 95% 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 June 3, 2026 at 7:33 AM.