Despite winning the Vezina Trophy in 1966–67, the 36-year old Hall was left unprotected for that summer's NHL expansion draft and was chosen by the St. Louis Blues. One of six expansion franchises in their first year in the league, the Blues stocked themselves with veteran talent, including Red Berenson and Phil Goyette, and won the West Division Playoffs in two seven-game series. Hall's play led them all the way to the Stanley Cup Finals. Most hockey fans expected an utter rout when the established Canadiens faced the 1st-year expansion Blues. But this was Hall's fourth trip to the finals, and his goaltending was the most outstanding contribution to the surprisingly good performance of the Blues against the Montreal Canadiens. The Blues lost the best-of-seven series getting swept 4–0, but in 4 exciting 1-goal games (3–2 (OT), 1–0. 4–3 (OT), and 3–2). Hall's remarkable play was recognized by being awarded the Conn Smythe Trophy as the playoffs' Most Valuable Player, an award rarely going to a player from a losing team. ‘Even though we lost to the Canadiens in a sweep, I don’t feel it tainted my winning the Smythe one bit’, said Hall. ‘The odds were heavily stacked against us right from the start.’
In 1968, veteran goaltending legend Jacques Plante joined the Blues, sharing duties with Hall. The two put together a fine season in 1968–69, winning the Vezina Trophy, and setting a then-Blues' record of 13 shutouts. Hall was voted the First Team All-Star goaltender emblematic of being the best goaltender in the league, his record seventh selection as such.
Hall ended his career with 407 wins, 84 shutouts, a career GAA of 2.49, and was voted to eleven All-Star Games. Hall is widely regarded as one of the first NHL goalies to master the butterfly style of goaltending. He is thought of by many as one of the best goalies to ever play the game. Hall still holds the record for the most First Team All-Star selections (7) which he achieved while playing the same era as other greats, Sawchuk and Plante—as well as other Hall of Famers, such as Johnny Bower and Gump Worsley.
In 1998, he was ranked number 16 on The Hockey News' list of the 100 Greatest Hockey Players, currently the highest rank for a living former goaltender (No. 13-ranked Jacques Plante died in 1986, and No. 9 Terry Sawchuk in 1970).
In 2005, the City of Humboldt, Saskatchewan erected a permanent monument to Hall's career in Glenn Hall Park on Highway #5 (Glenn Hall Drive). The tribute included highlights of his career from his junior days in Humboldt until his retirement from the NHL.
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