Mountain pine beetles infest the lodgepole pine, which makes up 8% of Colorado's 22 million acres (89,000 km2) of forests. Lodgepole pines are found at elevations between 6,000–11,000 feet (1,800–3,400 m). A previous notable outbreak occurred in Colorado in the 1970s but was significantly less detrimental than the current infestation. Of the 1,760,000 acres (7,100 km2) of lodgepole pine, about 70% have been damaged. High temperatures have allowedbeetleinfestations at higher elevations. According to a recent study,pine beetleshave expanded their infestation by 400,000 acres (1,600 km2). The infestation is primarily concentrated in the state's northern mountains. The infestation has been moving north and east from theGranbyandWinter Parkarea towardsLarimer County. It is estimated thatbeetle kills will leave behind a deforested area the size ofRhode Island.
The Colorado State Forest Service releases an annual report entitled Report on the Health of Colorado's Forests. The most recent survey, published in January 2017, presented the following statistics: