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.

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 California’s San Luis Obispo County rapidly expanded overnight and was covering more than 35,000 acres on Thursday morning, prompting evacuation orders, closing part of a highway and sending thick smoke billowing into neighboring counties. It is the biggest wildfire the state has seen this year.