She'll be buried next to her husband at the Ronald Reagan Presidential Library in Simi Valley.
Prior to her funeral, there will be an opportunity for members of the public to pay their respects at the Library, the spokesperson said. Details had not yet been announced Sunday afternoon.
Reagan, whose husband died in 2004, had appeared frail after suffering several falls in recent years. In May 2012 it was disclosed she had broken several ribs in a fall at her Los Angeles home six weeks earlier.