The control burn at Montana de Oro State Park spread 100 acres beyond its charted path Tuesday.

But, the unplanned fire is now 60 percent contained, Cal Fire says.

Cal Fire worked with California State Parks Tuesday night to prevent further spread despite strong offshore winds, and it expects full containment by Thursday.

“It was a cold wind out there last night, but the firefighters kept working on the steep slopes to put this fire out,” San Luis Obispo Cal Fire Chief Robert Lewin said.

Cal Fire planned a 430-acre burn to improve the wildlife habitat and reduce fire risks around Coon Creek in Montana de Oro.

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