The Oregon Canyon Mountains border the Trout Creek Mountains on the east along the Harney – Malheur county line ( according to the United States Geological Survey 's definitions ) , while the Pueblo Mountains are the next range west of the Trout Creek Mountains . The Bilk Creek Mountains in both Oregon and Nevada border the Trout Creek Mountains on the southwest ; the two ranges are separated by Log Cabin Creek and South Fork Cottonwood Creek . South of the Trout Creek Mountains is the Kings River Valley , which separates the Bilk Creek Mountains on the west from the Montana Mountains on the east .