Cully Dahlstrom's first foray into professional hockey occurred in his hometown of Minneapolis, where he played with the Minneapolis Millers of the CHL for three seasons from 1931 to 1934. In 42 games in 1933-34 he scored 13 goals and 15 assists for 28 points, his best output in his three years with the club.
From there, Dahlstrom played for a year with the St. Paul Saints, also of the CHL. The club then switched to the AHA for the 1935-36 season, where Dahlstrom collected 20 goals and 23 assists for 43 pints in 46 games in his second year in the league. Dahlstrom played one more season in the AHA before advancing to the NHL's Chicago Blackhawks in 1937-38. Appearing in all 48 games, Dahlstrom had ten goals and nine assists, numbers good enough to earn him the Calder Memorial Trophy as the league's top rookie.
Dahlstrom had an eight-year NHL career, playing 342 games, scoring 88 goals, 118 assists and 206 points. His most productive individual season was 1943-44, when he had 20 goals and 22 assists in 50 games.
Dahlstrom was part of the 1937-38 season when the Blackhawks were the Cinderella team of the year, shocking the media, fans, and other teams by winning the Stanley Cup. Dahlstrom is a member of the U.S. Hockey Hall of Fame.