The Pocatello Bannocks played in the Utah–Idaho League from 1926 to 1928. Pocatello's teams since then have played in the Pioneer League. The Pocatello Cardinals, an affiliate of the St. Louis Cardinals, played during the seasons of 1939–1942 and 1946–1951, as the league paused for three years during World War II. The Cardinals two Pioneer League titles, in 1942 and 1949. A new version of the Pocatello Bannocks started up in 1952, originally as a St. Louis Browns affiliate for the first two years. In 1957, they changed their name to the Pocatello A's to reflect their new connection to the Kansas City Athletics, and then in 1960 to the Pocatello Giants as the San Francisco Giants took over as their affiliate. After a final season as the Pocatello Bannocks in 1961, they changed their name to the Pocatello Chiefs in 1962 and remained under that name until they moved to Ogden, Utah, to become the Ogden Dodgers in 1966. Hall of Fame manager Tommy Lasorda managed the Chiefs in 1965. In 1984, baseball returned to Pocatello for two seasons, when the Lethbridge Dodgers relocated as the Pocatello Gems. This was the same team that had left in 1966. The Pocatello Giants were affiliated with the San Francisco Giants for the 1988 and 1989 seasons; prior affiliation was with the Oakland A's. The home stadium was Halliwell Park, located on Alameda Drive. After the 1989 season the Giants ended their farm team affiliation with the franchise. The franchise became an independent/co-op team and was renamed the Gate City Pioneers for the 1990 season; that team featured players from the Montreal Expos and Chicago White Sox farm systems as well as minor league players from the Hiroshima Toyo Carp of the Nippon Professional Baseball. For the 1991 season, the team changed its name to the Pocatello Pioneers. The franchise to relocated to Lethbridge, Alberta, where they became the Lethbridge Mounties. Pocatello gained one more team in 1993, when the Salt Lake City Trappers - forced out by the move of a Class AAAPacific Coast League team to the city - moved to town as the Pocatello Posse in 1993. After the 1993 season, the team moved to Ogden, Utah, to become the Ogden Raptors. ;Semi-pro team A new team, the Gate City Grays, was formed in 2014 as part of the Northern Utah League. They were undefeated in their first regular season and won the league championship the next two seasons. The Grays are a semi-professional team not associated with MLB. Games are played at Halliwell Park.
