Flanner was honored with the Emily Chamberlain Cook Prize in 1920 for her poem Young Girl.
Along with her mother, Flanner lost her home and most of her possessions in the Berkeley Fire of 1923, prompting them to move to southern California.
On June 29, 1926, Flanner married architect and artist Frederick Monhoff and lived in Altadena with their child, John, born in 1941.
Hildegarde Flanner continued to write under her maiden name, chronicling events in her life as well as the changing landscape of California in the twentieth century.
Flanner and Monhoff spent their later years on their property in Calistoga, Napa Valley, California.