The complex resulted in the evacuation of numerous residential areas and the closure of portions of Plumas National Forest.

[5] Burning on Horton Ridge, to the west of Dixie Mountain, the Dotta Fire started on June 30, 2021.

[9] The Sugar Fire started on the southeast side of Sugarloaf Peak, three miles northeast of Beckwourth, California, near Nervino Airport, adjacent to the Plumas National Forest, on July 2.

[11] Twenty firefighters from Puerto Rico arrived to help fight the fires alongside California crews.

[12] Houses and outbuildings in the immediate area were threatened, with fire crews implementing structure protection on July 3.

In the late afternoon of July 6, the Sugar Fire jumped containment lines, fueled by gusty winds.

Evacuation warnings were put back in place for Dixie Valley and extended to Frenchman Cove.

[7] The fire pushed towards Dixie Lookout in the north and began spotting around Frenchman Lake.

[17] The fire continued to expand towards the evacuated Doyle Grade area and eventually created a pyrocumulonimbus cloud, producing its own lightning.

[24] By the end of the week, it was reported that 33 homes were destroyed in the community of Doyle in Lassen County by the Sugar Fire.

[17] The Sugar Fire also resulted in mandatory evacuations in Washoe County, Nevada for Fish Springs, Flanigan Flats and Rancho Haven.

[21] To support relief efforts, the Portola Baptist Church in Portola, California, Lassen County Fairgrounds in Susanville, California, and Hug High School and the Reno-Sparks Livestock Events Center in Reno, Nevada, served as evacuation points.

[30][31] This article incorporates public domain material from websites or documents of the United States Forest Service.