The Wenatchee Mountains are a range of mountains in central Washington State, United States of America. A major subrange of the Cascade Range, extending east 50 miles (80 km) from the Cascade crest, the Wenatchee Mountains separate the drainage basins of the Yakima River from the Wenatchee River. The crest of the range forms part of the boundary between Chelan and Kittitas Counties.

Kittitas County is a county located in the U.S. state of Washington. At the 2020 census, its population was 44,337. Its county seat and largest city is Ellensburg. The county was created in November 1883 when it was carved out of Yakima County. Kittitas County comprises the Ellensburg, Washington, Micropolitan Statistical Area.