The most destructive wildfire in Colorado history was the Black Forest Fire of 2013, which resulted in 511 destroyed homes and two deaths. Prior to the Black Forest Fire, the most destructive wildfires were the High Park and Waldo Canyon fires of 2012, which destroyed 248 and 346 homes respectively.
Unlike the High Park Fire and the Waldo Canyon Fire, the Black Forest Fire is not believed to have been the product of natural causes, with authorities continuing the investigation into its origins as of 2015. The fire started in a residential area, after which winds spread it to higher density properties within hours. The Black Forest Fire resulted in about $90 million of property damage, and cost over $9 million to fight. It spanned June 11th to June 20th, 2013, during which Colorado was experiencing record-setting heat and unusually high winds.