The fire happened on Kirker Pass Road at Hess Road, according to the Contra Costa Fire Department posting on X around 5:46 p.m.
Southbound Kirker Pass Road remained shut down after the fire was put out, and officials asked the public to avoid the area, ConFire said.
ConFire said the fire began from a car fire.
The blaze was not far from the Concord Pavilion.