Just before 7:00 pm Sunday, Contra Costa County firefighters responded to a vegetation fire on Mokelumne Drive near Lone Tree Elementary School.
Firefighters originally responded to a small grass fire near the school, but observed a large cloud of smoke coming from the area.
No homes were threatened and firefighters were able to control the fire and limit its spread to 4-acres.
Crews were on scene for 2-hours and there were no injuries were reported.
During the incident, East Contra Costa Fire Protection District Engine 52 assisted Contra Costa Fire.