In the United States , Super Tuesday commonly refers to the Tuesday in early February or March of a presidential election year when the greatest number of states hold primary elections to select delegates to national conventions at which each party 's presidential candidates are officially nominated . In the United States , Super Tuesday , in general , refers to the Tuesday in February or March of a presidential election year when the greatest number of states hold primary elections to select delegates to national conventions at which each party 's presidential candidates are officially nominated .