Frost's father was a teacher and later an editor of the San Francisco Evening Bulletin (which later merged with The San Francisco Examiner), and an unsuccessful candidate for city tax collector. After his death on May 5, 1885, the family moved across the country to Lawrence, Massachusetts, under the patronage of Robert's grandfather William Frost, Sr., who was an overseer at a New England mill. Frost graduated from Lawrence High School in 1892. Frost's mother joined the Swedenborgian church and had him baptized in it, but he left it as an adult.
Robert Frost's personal life was plagued by grief and loss. In 1885 when he was 11, his father died of tuberculosis, leaving the family with just eight dollars. Frost's mother died of cancer in 1900. In 1920, he had to commit his younger sister Jeanie to a mental hospital, where she died nine years later. Mental illness apparently ran in Frost's family, as both he and his mother suffered from depression, and his daughter Irma was committed to a mental hospital in 1947. Frost's wife, Elinor, also experienced bouts of depression.