Thousands of fans are already lined up along the parade route that stretches from Fenway Park to City Hall.
Two dozen Boston Duck Tour duck boats are lined up along the warning track inside Fenway Park as players and Sox officials address a crowd of supporters inside the stadium.
Saturday's parade departs Fenway Park at 10 a.m., will travel down Boylston Street to the Boston Common where it will turn left onto Tremont Street toward Government Center. The rally will then turn slight left onto Cambridge Street and then turn right onto Blossom Street and head into the Charles River near the Museum of Science.
It is the third Sox championship and rolling rally since 2004.
The Red Sox beat the St. Louis Cardinals during Game 6 of the World Series on Wednesday night.