Update: Walnut Fire burns 1.9 acres in Contra Costa County

Published Sep 5, 2025 #Walnut fire

Updated: 6:14 p.m. Sep. 4

First discovered: 4:37 p.m. Sep. 4

Initial location: Contra Costa County, Calif.

Fire type: Wildfire

Fire name: Walnut

Walnut Fire initially started today at 4:37 p.m. in Contra Costa County, California.

At this time, the containment status is unknown and the cause of the fire remains undetermined.

Source: National Interagency Fire Center