A wildfire exploded overnight in California, with the massive blaze prompting evacuation orders and a highway closure. The Madre Fire ignited Wednesday afternoon in San Luis Obispo County, according to Cal Fire. It has since grown to more than 35,500 acres and is 5% contained as of Thursday morning, fire officials said.

The Madre Fire is the largest wildfire in California in 2025 — surpassing the Los Angeles-area fires that devastated parts of the region in January.

The fire has prompted evacuation orders, warnings and highway closures in San Luis Obispo County about 100 miles north of Los Angeles.