The High Cascades Complex was a group of 20 fires burning in four protected areas in Oregon, in the United States, specifically: Crater Lake National Park, Rogue River – Siskiyou National Forest, Umpqua National Forest, and Fremont–Winema National Forest. The first fire in the complex, the Blanket Creek Fire, was started by a lightning strike on July 29, 2017. In total, the fires have burned 72,309 acres (293 km2) and are 28% contained. The fires are directly impacting the communities of Prospect, Union Creek and Diamond Lake, park headquarters, old growth forests that house endangered species like the spotted owl and volcanic features.

The Rogue River–Siskiyou National Forest is a United States National Forest in the U.S. 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 ranges from the crest of the Cascade Range west into the Siskiyou Mountains, covering almost 1.8 million acres (7,300 km2). Forest headquarters are located in Medford, Oregon.