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.

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.

A wildfire in a wilderness area of central California has exploded in size. Dry, hot weather is raising the fire risk for large portions of the state ahead of the July Fourth holiday.