A fast-spreading wildfire in central California became the state's largest this year after reaching explosive proportions overnight as high temperatures and dry conditions increased the risk of wildfires ahead of the July 4th holiday.

The Madre Fire broke out on the evening of July 2 in a remote area of ??central California. California, near Highway 166, according to Cal Fire. The fire quickly spread to more than 35,000 acres (14,000 hectares) overnight, burning grasslands in a section of Los Padres National Forest.

As of around 9:30 p.m. PT on July 3, the fire had grown to nearly 50,000 acres (21,000 hectares) and was 10% contained, according to Cal Fire. Evacuation orders and warnings were issued for small communities near Highway 166 as the blaze moved into Carrizo Plain National Monument, about 70 miles (111 kilometers) southeast of San Luis Obispo, California.

The National Weather Service in Los Angeles reported that satellite imagery showed the fire impacting inland San Luis Obispo County, with a plume of smoke extending southeast of the fire over Santa Barbara and Ventura counties. Videos and images shared by the U.S. Forest Service also showed smoky skies and flames moving across mountainous terrain.

“With current weather, terrain, and fuel conditions, this fire has experienced exponential growth in less than 24 hours across multiple counties surrounding the San Luis Obispo County area,” the U.S. Forest Service said in a statement July 3. “The smoke impact will be far-reaching.”

The Madre Fire has become the largest wildfire in California in 2025, surpassing the Los Angeles-area blazes that devastated parts of the region. The Palisades Fire burned more than 23,000 acres, while the Eaton Fire burned more than 14,000 acres in January, according to Cal Fire.

California Gov. Gavin Newsom’s office, The governor's office reported that the fire originated on federally managed land before spreading to state-run areas. He also noted that the state has significantly increased Cal Fire resources to support the fire response and is working with federal and local partners. Cal Fire has rapidly deployed air and ground resources to assist our federal partners, the governor's office said in a statement. The state will always be present to protect all communities, no matter where a fire originates. As of July 3, no injuries or damage had been reported from the fire, according to Cal Fire. The San Luis Obispo County Fire Department reported that same day that about 208 people had been evacuated and that 50 structures were threatened by the blaze. Cal Fire reported that the cause of the fire is under investigation.