The game starts at 2 p.m.
The 75-year-old Tiant is a native of Cuba.
Tiant, who pitched for the Indians, Twins, Red Sox, Yankees, Pirates and Angels during 19 major league seasons, is one of 10 finalists on this year's Golden Era ballot that will be considered by the committee on managers, umpires, executives and long-retired players at the National Baseball Hall of Fame and Museum.
Fans will have the opportunity to meet “El Tiante” in a private meet-and-greet.
Tiant's appearance concludes a weekend full of celebrity visits for the Boulders. Orlando "El Duque" Hernandez threw out the first pitch before the start of the game on Friday and world-renowned aerialist, Nik Wallenda appeared on Saturday.
The Cuban National Team is in the midst of a 19-game, six-city trip through the Can-Am League.
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