Riddle Ranch is another old, historic ranch in Harney County, Oregon. It was built in the early 1900s by the Riddle brothers and then sold later on to Rex Clemens. In 1986, the Bureau of Land Management acquired the property.

The Riddle Ranch is historically significant for being a pioneer ranch and for having a series of Native American archaeological sites in its area. It has eight historic buildings and is located in the Donner und Blitzen Wild and Scenic River system, so it promises excellent views and scenery.

Today, the Riddle Ranch functions as an open air museum with other recreational activities to offer. You can contact the management for their schedules as they vary largely depending on the weather and conditions at the time.