Stillwagon did not make any appearances for the Titans during the 2013 season where they were ranked in the top 5 in the country for most of the 2013 season.
Stillwagon dominated both sides of the field as a senior at Valley Christian, going 3-1 with a 0.39 ERA on the mound while batting .463 and stealing 24 bases. He was named to the CIF Southern Section Division V team and leading the Crusaders to an Olympic League championship. Stillwagon also was named first-team all-Trinity League and Cerrito News Co-Player of the Year. Prior to becoming a Titan pitcher, he was the bat boy for the team in 2007.