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Region 5 National Forest Establishment Dates
| Year | Date | Forest(s) |
|---|---|---|
| 1907 | March 4 | All Forest Reserves changed to National Forests |
| 1907 | May 25 | Inyo National Forest |
| 1907 | October 26 | San Benito National Forest |
| 1908 | July 1 | Angeles National Forest established from San Bernardino, and parts of Santa Barbara and San Gabriel National Forests |
| 1908 | July 1 | San Luis Obispo National Forest renamed San Luis National Forest |
| 1908 | July 1 | Mono National Forest established from parts of Inyo, Sierra, Stanislaus, and Tahoe National Forests |
| 1908 | July 1 | Sequoia National Forest established from south portion of Sierra National Forest |
| 1908 | July 1 | Lassen Peak National Forest changed to Lassen National Forest |
| 1908 | July 1 | California National Forest established from parts of Trinity and Stony Creek National Forests |
| 1908 | July 1 | Cleveland National Forest established by consolidating Trabuco Canyon and San Jacinto National Forests |
| 1908 | July 1 | Warner National Forest incorporated into Modoc National Forest |
| 1908 | July 1 | Diamond Mountain National Forest incorporated into Plumas and Lassen National Forests |
| 1908 | July 1 | Pinnacles and San Benito National Forests incorporated into Monterey National Forest |
| 1909 | February 18 | Calaveras Bigtree National Forest (administratively combined with Stanislaus) |
| 1910 | July 1 | San Luis National Forest incorporated into Santa Barbara National Forest |
| 1910 | July 1 | Kern National Forest established from part of Sequoia National Forest |
| 1910 | July 28 | Eldorado National Forest established from parts of Tahoe and Stanislaus National Forests. |
| 1915 | July 1 | Kern National Forest transferred back to Sequoia National Forest |
| 1919 | August 18 | Monterey National Forest incorporated into Santa Barbara National Forest |
| 1925 | September 30 | San Bernardino National Forest re-established from parts of Angeles and Cleveland National Forests |
| 1932 | July 12 | California National Forest renamed Mendocino National Forest |
| 1936 | December 3 | Santa Barbara National Forest renamed Los Padres National Forest |
| 1945 | July 1 | Mono National Forest incorporated into Inyo and Toiyabe National Forests |
| 1947 | June 3 | Six Rivers National Forest established from parts of Klamath, Siskiyou, and Trinity National Forests |
| 1954 | July 1 | Shasta-Trinity National Forest administratively combined |