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.

A wildfire in a wilderness area of central California exploded in size as dry, hot weather raised the fire risk for large portions of the state ahead of the July Fourth holiday.