Peterson is of Danish and Swedish descent and was raised in Mandan, North Dakota where he met his future wife, Kay. He and Kay married in 1938 and had at least two children, Sandra Kay and Billy. While living in North Dakota, he played American Legion baseball and worked at a vocational school.
In 1940, he departed Mandan for Jackson, Mississippi to train at a baseball school. He received his first professional contract with the St. Louis Browns as a result and was sent to play for the Youngstown Browns. He spent the ensuing offseason working at a rubber factory in Youngstown.
Peterson made the roster out of spring training in 1943 but did not make his Major League debut until May 4. He pitched two scoreless innings in relief of Daffy Dean at Sportsman's Park. He made what would be the final outing of his Major League career on May 12. A week later, on May 19, Peterson and Fred Sanford were demoted to the Toledo Mud Hens in order to meet the 25-player roster limit.

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