The Canyon Fire was a wildfire near Castaic, California that began on August 7, 2025. It was fully contained on August 14, 2025. The fire burned 5,370 acres (2,173 ha).

100 °F+ temperatures across inland Southern California valleys, paired with afternoon canyon winds, contributed to the Canyon Fire’s rapid growth along the Los Angeles–Ventura County line. Low relative humidity and a series of red flag warnings issued by the National Weather Service further worsened conditions, as hot, dry air massed over the region during an extended summer heat wave.

Persistent drought across Southern California compounded the threat. According to the CAL FIRE seasonal outlook, precipitation totals since the start of summer 2025 were well below average, leaving chaparral and brush at critically low fuel moisture levels. This extended drying period accelerated flammability, while the absence of coastal moisture intrusions from the Pacific failed to moderate fire weather conditions.

The Canyon Fire was first reported on August 7, 2025, at around 1:25 p.m. PST near Highway 126 and Castaic in northern Los Angeles County, close to the border with Ventura County.

By the evening of August 7, the fire had grown to nearly 4,900 acres with no containment. Evacuation orders were issued for around 2,700 residents, affecting roughly 700 structures, while evacuation warnings covered about 14,000 residents and thousands of additional structures.

On August 8, more than 400 firefighters, assisted by aircraft and ground equipment, worked to contain the blaze. Containment improved to about 28% that day, and some evacuation orders were downgraded to warnings as conditions stabilized.

The fire ultimately burned 5,370 acres before being fully contained later in August.

The cause of the wildfire is under investigation.