Forward progress was halted, according to the Contra Costa Fire Protection District at 6:30 p.m.
WATCH: Timelapse video shows progression of John Fire in Pittsburg
Timelapse video shows progression of John Fire in Pittsburg
The blaze began as a building fire at 2225 John Henry Johnson Pkwy around 5 p.m., but the flames extended to a grassy area that used to be the Delta View Golf Course, and a vegetation fire response was launched.
At 5:30 p.m., a second alarm was issued to assist with structure protection, Con Fire said. CAL FIRE assisted with the response, the agency said on social media.
Crews will remain through the night to mop up hot spots, the Con Fire said.
There have been no injuries.