Pinnacles National Forest was a United States National Forest in California. It was established as the Pinnacles Forest Reserve under the authority of the U.S. Forest Service by Presidential proclamation on July 18, 1906 with 14108 acre. It became a national forest on March 4, 1907 when all U.S. national forest reserves were redesignated as national forests by act of U.S. Congress. On July 1, 1908, Pinnacles was added to Monterey National Forest by executive order, and the name was discontinued. The lands currently exist in Los Padres National Forest and in Pinnacles National Park, proclaimed as Pinnacles National Monument by Theodore Roosevelt in 1908.