Tatar, 32, appeared in all 82 games for the New Jersey Devils last season.
Tatar has also played for the Detroit Red Wings, Vegas Golden Knights, and Montreal Canadiens.
Selected by Detroit in the second round (60th overall) of the 2009 NHL Entry Draft, Tatar has recorded 211 goals and 455 points in 783 career NHL games.
“Tomas has been a consistent, productive player throughout his NHL career,” said Avalanche General Manager Chris MacFarland. “He is a veteran winger who brings scoring depth to our middle six and can contribute at both ends of the ice. We are excited to have him under contract for this season.”
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