The CZU Lightning Complex fires were wildfires that burned in Northern California starting in August 2020.

Two days after the fires began, a change in wind conditions caused these three northern fires to rapidly expand and merge, growing quickly to over 40,000 acres, exacerbated by conditions caused by climate change.

[4][5] The fires destroyed 1,490 buildings,[1] including in the communities of Boulder Creek,[6] Bonny Doon,[7] Swanton,[8] and along Empire Grade Road.

[9] Fires burned in both Butano[10] and Big Basin Redwoods state parks, where a number of historic buildings were destroyed, including the visitor center at Big Basin.

[12] On September 22, Cal Fire reported that the complex, which had covered 86,509 acres (35,009 ha), had been fully contained.