UPDATE JUNE 7: The brush fire, known as the Border 6 Fire, is now 100% contained.
UPDATE JUNE 4, 4:36 p.m.: The fire is now 70% contained with a revised total of 2,525 acress with 1,516 acres burned inside the United States and 1,009 acres burned inside Mexico, according to Cal Fire.
UPDATE (June 4): Cal Fire officials said the Border 6 Fire is 50% contained as of early Thursday morning. The fire has scorched 2,617 acres, the agency said.
UPDATE (June 3): All evacuation warnings have been lifted in zones SDC-2544, SDC-2545, SDC-2605, SDC-2643, SDC-2644 and SDC-2645.
As of Wednesday evening, the fire is now 25% contained, according to Cal Fire.
A brush fire that erupted in Mexico earlier this week burned into the U.S. side of the border in south San Diego County on Tuesday, charring hundreds of acres in the Dulzura area and prompting evacuation warnings.
The Border 6 Fire was first reported Monday afternoon in Mexico, but it crossed over the border late Tuesday morning and burned dozens of acres in Marron Valley, located south of Dulzura and near the Tijuana River.
As flames continued to spread towards communities, evacuation warnings were issued for certain areas designated by the San Diego County Sheriff’s Office. Evacuation warning map: https://protect.genasys.com/location?z=12.10857788093667&latlon=32.60096898795872%2C-116.725705114027
A temporary evacuation center was established at Steele Canyon High School in Spring Valley (12440 Campo Rd.) The American Red Cross opened a shelter at the Spring Valley Community Center (8735 Jamacha Blvd.)
#Border6Fire If you live near Dulzura, be aware of increased law enforcement and firefighting activity. A brush fire is burning south of Dulzura along the U.S./Mexico border.An EVACUATION WARNING is in place for the shaded areas in yellow shown in the map below. Be prepared to… pic.twitter.com/cAccSbO8IH#Border6Fire [update 1:00 p.m.] Aircraft have mapped the total acreage 2,617 acres. This includes both the U.S. and Mexico side. There are 992 acres burned in Mexico and 1625 acres burned in the U.S. The fire remains 5% contained.
— CAL FIRE/San Diego County Fire (@CALFIRESANDIEGO) June 3, 2026
Ground crews had to labor over a rocky, mountainous landscape while battling the blaze along with personnel in air tankers and water-dropping helicopters, Cal Fire Capt. Mike Cornette said.
The cause of the fire is unknown.
