The 2009–10 Colorado Avalanche season was the franchise's 38th season, 31st in the National Hockey League (NHL) and 15th as the Colorado Avalanche.
On June 3, 2009, the Avalanche began a complete overhaul of the coaching staff by firing head coach Tony Granato, along with assistants coaches Jacques Cloutier and Dave Barr, goaltending coach Jeff Hackett, assistant to the general manager Michel Goulet and video coordinator PJ DeLuca. Also on June 3, the Avalanche hired Greg Sherman as their new general manager, replacing Francois Giguere, who had been fired in April. On June 4, Joe Sacco was hired to be the new head coach. Before Sacco's hiring, an offer had been made to former Avalanche goaltender Patrick Roy to become head coach, which Roy declined.
Defenceman Adam Foote was named team captain following the retirement of long-time captain Joe Sakic.
On July 9, 2009, Avalanche captain Joe Sakic announced his retirement from the NHL after 20 seasons. The Avalanche retired Sakic's jersey #19 in a ceremony before the October 1, 2009 home opener of the 2009-10 season. On November 12, 2009, the Avalanche unveiled a new third jersey.
On February 10, 2010, Kyle Cumiskey scored just 9 seconds into the overtime period to give the Avalanche a 4-3 home win over the Atlanta Thrashers. It would prove to be the fastest overtime goal scored during the 2009-10 NHL regular season.
bold – Qualified for playoffs; y – Won division; z – Won conference (and division)
Win (2 points) Loss (0 points) Overtime/shootout loss (1 point)
Key: Win Loss
Note: GP = Games played; G = Goals; A = Assists; Pts = Points; +/− = Plus/minus; PIM = Penalty minutes
Note: GP = Games played; TOI = Time on ice (minutes); W = Wins; L = Losses; OT = Overtime losses; GA = Goals against; GAA= Goals against average; SA= Shots against; Sv% = Save percentage; SO= Shutouts; G= Goals; A= Assists; PIM= Penalties in minutes
†Denotes player spent time with another team before joining Avalanche. Stats reflect time with the Avalanche only.
‡Traded mid-season
The Avalanche were involved in the following transactions during the 2009–10 season.
Colorado had 7 picks at the 2009 NHL Entry Draft in Montreal, Quebec.
The Avalanche's American Hockey League affiliate was the Lake Erie Monsters, based in Cleveland, Ohio.
The Johnstown Chiefs of the ECHL were the Avalanche's second-tier affiliate.
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