In 1956 Larsen posted 11–5 record, with a career best 107 strikeouts and a 3.26 ERA. Larsen was used in between the bullpen and the starting rotation for most of the season, participating in 38 games, starting 20. Larsen had a rough start to the season, and by the end of May he had a 5.64 ERA. He gradually improved and by the beginning of August, Larsen lowered his ERA below 4.00. In a seven start stretch to finish the season, Larsen had five complete games, and pitched 10 innings in another. He pitched a four-hit shutout against his former team (Orioles) in the second game of a doubleheader on September 3. He finished the season with a 7–3 victory against the Boston Red Sox on September 28.