The vegetation fire burning in a rural area between Arroyo Grande and Nipomo held at 244 acres overnight, while containment grew to 60 percent, Cal Fire says.
The fire started just before 2 p.m. in the 4900 block of Huasna Townsite Road, according to Cal Fire.
Cal Fire spokesman Chris Elms said the agency has “a lot of ground and air resources working very hard to complete containment while the weather is in our favor.”
Winds of between 10 and 14 mph are expected later in the day, which could potentially stir up the fire, he said, but crews are working to take advantage of the relatively calm morning to get the fire under control.
Other challenges to containment are very steep terrain, heavy vegetation and poor access to a lot of the fire.
Elms said it is too early to say when full containment could be reached, but anticipates crews working on scene through Friday.