Arminda Fix was born October 1, 1872 in Walla Walla, Washington, the third of eight children born to early Walla Walla pioneers Andrew J. Fix and Nancy Sanders Fix. She entered Whitman Academy in 1891 and attended Whitman College from 1894-1899, receiving a B.S. in 1899. She subsequently attended library school in New York and studied at Columbia University and the University of Washington.

Fix became the first librarian of Whitman College in 1899, a post she held until 1916. Her duties included supervising academy students during study hours, running the bookstore, and day to day library operations. She later worked at the Walla Walla Public Library.

Fix had a passion for writing and oration. Her poetry was often published in programs for local events. She was renowned for her speeches given regularly at local club meetings and gatherings, and she kept a diary regularly from 1889 to 1907 and sporadically from 1933 to 1957.

Fix was active in several local organizations, including the Daughters of the Pioneers of Washington, the Narcissa Prentiss Chapter of the Daughters of the American Revolution, the Walla Walla and Washington State Historical Societies, the YWCA, the Delta Gamma Sorority, the Delphian Cultural Club, and the Walla Walla Garden Club. She served as an officer in several of these organizations, and was recognized locally for her service.

Fix died March 22, 1965 in Walla Walla.