The Boulder Fire was a wildfire that burned in California Valley in San Luis Obispo County, California in the United States. The fire started on June 5, 2019 and burned . It was 100% contained by the evening of June 5. Fire The Boulder Fire was reported at 10:49 AM on Boulder Creek Trail in California Valley, California on June 5, 2019. The fire, fueled by grass, had grown to acres by the time it was reported. By noon, the fire had grown to . Within a half an hour, 40 percent of it had been contained and one building and a solar array were under threat. The fire's smoke, which was very dark, was visible in eastern San Luis Obispo. Air tankers were assigned to fight the fire later in the day. The fire was contained by the evening of June 5. It had burned a total of . References External links 2019 California wildfires June 2019 events in the United States Wildfires in San Luis Obispo County, California