Kammala jumla mai zuwa: Bayan kakar wasa, babban manajan Bobby Clarke ya ki sanya hannu kan sabuwar yarjejeniya tare da McCrimmon, maimakon haka ya zabi ya yi ciniki da shi. An tura shi zuwa Calgary Flames a ranar 27 ga Agusta, 1987, a musayar zagaye na uku a 1988 NHL Entry Draft da zagaye na farko a
Tsarin shekarar 1989. A kan Flames na 1987/88, McCrimmon ya shiga Al MacInnis, Paul Reinhart, Gary Suter da Ric Nattress don samar da daya daga cikin manyan masu karewa a NHL. Ya zira kwallaye 42 don Flames, ya lashe kyautar NHL Plus-Minus tare da jagorar gasar +48 kuma an kira shi na biyu All-Star. Bugu da ƙari, ya buga a 1988 All-Star Game.