Cleveland National Forest encompasses 460,000 acres, mostly of chaparral, with a few riparian areas. A warm dry mediterranean climate prevails over the forest. It is the southernmost U.S. National Forest of California. It is administered by the U.S. Forest Service, a government agency within the United States Department of Agriculture. It is divided into the Descanso, Palomar and Trabuco Ranger Districts and is located in the counties of San Diego, Riverside, and Orange.
Cleveland National Forest was created on July 1, 1908 with the consolidation of Trabuco Canyon National Reserve and San Jacinto National Reserve by President Theodore Roosevelt and named after former president Grover Cleveland. It is headquartered in San Diego. The Cleveland National Forest was the site of both the 2003 Cedar Fire, and the Santiago Canyon Fire of 1889. Both fires widely consumed many sections of the area, as well as endangering many animal species.