Monticello National Forest was established as the Monticello Forest Reserve by the U.S. Forest Service in Utah on February 6, 1907, with . It became a National Forest on March 4, 1907. On July 1, 1908, it was combined with La Sal National Forest, which was renamed La Salle National Forest for a short time. The lands presently exist in Manti-La Sal National Forest as the Monticello Section of the La Sal Division of the Manti-La Sal National Forest.