Fister bats left-handed, and throws right-handed. He was born in Merced, California and attended Golden Valley High School. He then attended Merced College, and later Fresno State University. He spent four seasons (2006–2009) in the Seattle Mariners minor league organization before being promoted to their Major League roster in 2009.

Fister was born February 4, 1984, to Larry and Jan Fister. Larry Fister is a fire captain who played football at Fresno State University from 1976 to 1977. Jan is a homemaker. Fister has three siblings; a brother and two sisters. He grew up in Merced, California where he began playing baseball at the age of six.

He was a fan of both the Oakland Athletics and San Francisco Giants as a child. His favorite player was Cal Ripken, Jr. Fister also played soccer, football and basketball as a child. He shares a middle name (Wildes) with both his father and grandfather.

Fister attended Golden Valley High School where he pitched and was the team's utility player. He was a two-year letterman and a first-team All-Central California Conference selection in his senior season, batting .456 with a home run and 12 runs batted in (RBIs). He was also named a first team all-conference selection in basketball, averaging over 30 points per game as a senior. He and former MLB catcher Dusty Ryan graduated in the same class.

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