Parker Retzlaff initially began racing Junior Sprints at the age of 7, before moving into Bandoleros on asphalt one year later. Traveling across the United States to compete, Parker placed 7th in the Winter Heat in Charlotte North Carolina, 4th at Winter Nationals in Orlando Florida, and placing 2nd at the Battle of the Big Top at Texas Motor Speedway. Parker took the Wisconsin State Championship in 2014. In 2015, and at the age of 12, he made the transition over to a full bodied late model truck. The 2016 season Parker finished 2nd in points and was awarded Rookie of the Year.