Mount Horrible is a summit of the Blue Mountains in Asotin County, Washington, in the United States. With an elevation of 5,804 feet (1,769 m), Mount Horrible is the 906th highest summit in the state of Washington. Along with neighboring Mount Misery, it was named by 19th century pioneers for the difficult conditions they experienced on the Grouse Flat.
- U.S. Geological Survey Geographic Names Information System: Mount Horrible
- Hill, Craig (October 17, 2015). "Where did Washington's most creative place names come from?". The News Tribune. Retrieved May 26, 2019.
- "Mount Horrible". Peakery.com. Retrieved February 11, 2015.
- Tucker, Gerald J. (1940). "History of the Northern Blue Mountains" (PDF). United States Forest Service. p. 96. Retrieved May 20, 2019 – via Silviculture Library Archives.