Rainbow trout are found in mountain streams and rivers in North America. It is found in the Pacific coast of Canada, the United States, Mexico, Japan, Europe, Oceania, South America, parts of East Asia, and in the rivers of Colombia. Rainbow trout is an introduced species. Most of the country's more than 50 professional rainbow trout farms are located in Beijing, Heilongjiang, Shandong, Shanxi, Liaoning, Jilin and Shaanxi.