Zennon played football for more than ten years. Starting in 2005, he played for the Michigan City Pop Warner program where he made back-to-back trips to the Pop Warner Super Bowl in 2012 and 2013. Then, as a starting wide receiver for Michigan City High School, he made back-to-back trips to semi-state in 2017 and 2018. The 2017 team was the first to win a sectional title in school history.