The Rogue River-Siskiyou National Forest is a United States national forest in the US states of Oregon and California. The formerly separate Rogue River and Siskiyou National Forests were administratively combined in 2004. Now the Rogue River-Siskiyou National Forest extends from the crest of the Cascade Range west into the Siskiyou Mountains, covering nearly 1.8 million acres (7,300 km2). The forest's headquarters are in Medford, Oregon.