The Pioneer League is an independent baseball league that operates in the Rocky Mountain region of the United States. Its teams are not directly affiliated with Major League Baseball (MLB). It is designated as an MLB Partner League. From 1939 to 2020, the Pioneer League was affiliated with Minor League Baseball and its teams were affiliated with MLB teams. It operated as a Class C league from 1939 to 1942 and from 1946 to 1962. It was elevated to Class A for 1963 and was a Rookie-level league from 1964 to 2020. More information...
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