Update: Mammoth Fire in Sierra County – April 20 status

Published Apr 21, 2025 #Mammoth fire

Updated: 5:59 p.m. April 20

First discovered: 3 hours ago, 2:15 p.m. April 20

Initial location: Sierra County, Calif.

Fire type: Wildfire

Fire name: Mammoth

Mammoth Fire initially started today at 2:15 p.m. in Sierra County.

It has been burning on private land for three hours. There is no update on the containment progress of the fire and its cause has not yet been determined.

Source: National Interagency Fire Center