Trimountain is an unincorporated community and census-designated place (CDP) in the northern part of Adams Township, Houghton County, Michigan, United States. It is along highway M-26 between South Range to the northeast and Painesdale to the southwest. Houghton, the county seat, is to the northeast. As of the 2020 census, Trimountain had a population of 212.
Trimountain was first listed as a CDP prior to the 2020 census.