Cardston, town (1991 pop. 3,480), SW Alta., Canada, near the U.S. boundary. It was founded in 1887 by Mormons from Utah under the leadership of Charles Ora Card, son-in-law of Brigham Young. The chief Mormon temple of Canada is in the town. It is a ranch and irrigation agriculture center. Nearby is the Blood Reserve, the largest reserve for Native Americans in Canada.