 Dukes attended Hillsborough High School in Tampa, Florida his junior and senior years, after spending his first two years of high school at Jefferson High School, C. Leon King High School, and George D. Chamberlain High School.He lettered for all four years in football and baseball and two years in basketball and track.In football, as a junior, he started at both tailback and middle linebacker, was named a Class 3A All-State selection as a linebacker, and rushed for over a thousand yards on offense.