The Jan. 1 matchup was reported last week but wasn't formally announced until Sunday. The location has not been revealed but it's likely to be played at Nationals Park.
"It's an honor to be selected by the NHL to participate in the 2015 Winter Classic," Hawks President and CEO John McDonough said in a statement. "This is another marquee event for the Blackhawks and we're looking forward to spending New Year's Day in our nation's capital."
It will mark the Hawks' third outdoor appearance after facing the Red Wings in the 2009 Winter Classic at Wrigley Field and also hosting the Penguins last March at Soldier Field as part of the NHL's Stadium Series.
The Hawks announced they will begin training camp at Notre Dame for the second consecutive season. That part of camp will run Sept. 19-21.
"We are pleased to have the opportunity to return to Notre Dame and their world-class facility," Hawks general manager Stan Bowman said in a statement. "We received an overwhelming positive response from our players and staff on their experience at Notre Dame last September and are looking forward to another great weekend to kick off training camp next season."
Chris Kuc's 10 games to watch during the 2014-15 regular season:
Oct. 9 vs. Stars in Dallas
The team that general manager Stan Bowman assembles will take the ice together for the first time in a game that matters.
The home crowd will get its initial look at the Hawks' roster in the team's first appearance on United Center ice since they fell in Game 7 of the Western Conference finals to the eventual Stanley Cup champion Kings.
Oct. 25 vs. Blues in St. Louis
It won't take long to find out if hard feelings remain between the Central Division rivals after a hard-fought, first-round playoff series resulted in the Hawks advancing.
Nov. 29 vs. Kings in Los Angeles
Not only will the Hawks complete their annual circus trip with their sixth game in 10 days, they will do it against the team that ended their dream of a second consecutive Stanley Cup.
Dec. 3 vs. Blues at the United Center
The 300 level boo-birds should be in full voice when David Backes and the rest of the Blues make their initial stop in Chicago.
Jan. 1 vs. Capitals at Washington
What better way to celebrate the new year than with a hockey game in the great outdoors?
Jan. 21 vs. Penguins in Pittsburgh
Sidney Crosby & Co. will be the first team the Hawks meet when they kick off a seven-game trip that will stretch until Feb. 8 because of a five-day break for the All-Star Game in Columbus.
Feb. 9 vs. Coyotes at the United Center
A day after completing the grueling road trip, the Hawks will settle in for a season-long, eight-game homestand with the Coyotes first on the agenda.
March 2 vs. Hurricanes at the United Center
April 11 vs. Avalanche in Colorado
All 30 NHL teams will be in action on the final day of the regular season and if the stretch run of the 2013-14 campaign was any indication, this game could have major Central Division implications.