On February 14, 2013, Tokarski was traded to the Montreal Canadiens in exchange for goaltender Cédrick Desjardins.

On March 5, 2014, Tokarski played his first game with Montreal, a 4–3 shootout victory over the Anaheim Ducks.
On March 16, he recorded his first NHL shutout in a 2–0 win over the Buffalo Sabres, stopping all 29 of Buffalo's shots.
On 19 May, it was announced Tokarski would be starting in place of Montreal's Carey Price due to a suspected sprained knee Price sustained against the New York Rangers.
He started Game 2 of the Eastern Conference Finals against the Rangers but stumbled in his first playoff game with a 3–1 loss.
He remained solid in the third period but the Canadiens had problems getting goal scoring.
In Game 3, Tokarski made 35 saves on 37 shots to help the Canadiens win 3–2 in overtime, cutting the Rangers' series lead to 2–1.
In Game 4, he played well and had a good chance to have a win but lost in overtime, 3–2.
In Game 5, he then led the team to a 7–4 win, staving off elimination and reducing the Rangers' lead to 3–2 in the series.
In Game 6, he stopped 31 shots on 32 shots to give his team a chance to win.
Although the Canadiens lost the series 4–2 against New York, Tokarski's performance earned high praises.

Following the conclusion of the Canadiens' 2014–15 pre-season, goaltender Peter Budaj was traded to the Winnipeg Jets on October 6, 2014, effectively leaving Tokarski as Carey Price's backup for the regular season.

At the beginning of the 2015–16 season, on October 5, 2015, Tokarski was placed on waivers, ending his tenure as backup goaltender for the NHL club.
After fellow Canadiens' prospect Mike Condon had a strong showing in training camp, the team took him over Tokarski.
On February 14, 2013, Tokarski was traded to the Montreal Canadiens in exchange for goaltender Cédrick Desjardins.
On March 5, 2014, Tokarski played his first game with Montreal, a 4–3 shootout victory over the Anaheim Ducks. On March 16, he recorded his first NHL shutout in a 2–0 win over the Buffalo Sabres, stopping all 29 of Buffalo's shots. On 19 May, it was announced Tokarski would be starting in place of Montreal's Carey Price due to a suspected sprained knee Price sustained against the New York Rangers. He started Game 2 of the Eastern Conference Finals against the Rangers but stumbled in his first playoff game with a 3–1 loss. He remained solid in the third period but the Canadiens had problems getting goal scoring. In Game 3, Tokarski made 35 saves on 37 shots to help the Canadiens win 3–2 in overtime, cutting the Rangers' series lead to 2–1. In Game 4, he played well and had a good chance to have a win but lost in overtime, 3–2. In Game 5, he then led the team to a 7–4 win, staving off elimination and reducing the Rangers' lead to 3–2 in the series. In Game 6, he stopped 31 shots on 32 shots to give his team a chance to win. Although the Canadiens lost the series 4–2 against New York, Tokarski's performance earned high praises.
Following the conclusion of the Canadiens' 2014–15 pre-season, goaltender Peter Budaj was traded to the Winnipeg Jets on October 6, 2014, effectively leaving Tokarski as Carey Price's backup for the regular season.
At the beginning of the 2015–16 season, on October 5, 2015, Tokarski was placed on waivers, ending his tenure as backup goaltender for the NHL club. After fellow Canadiens' prospect Mike Condon had a strong showing in training camp, the team took him over Tokarski.
Dustin Tokarski