Mackay was born in 1864 in
Rakaia. Her Scottish parents were the shepherd (later station manager) Robert Mackay and his wife, Elizabeth Mackay (), and she was the eldest of a large family of daughters. She was homeschooled until she was 14 and went to Christchurch to train as a teacher, and taught at small rural schools from 1887 until 1898. She moved to
Dunedin in 1898, and worked as a journalist for the
Otago Witness for four years. Her work at this time was published in the short-lived New Zealand literary magazine
New Zealand Illustrated Magazine (founded in Auckland in 1899, last publication 1905). After the closure of the
Canterbury Times in 1917 she began writing freelance for other publications such as the
White Ribbon, the journal of the
Women's Christian Temperance Union of New Zealand, and for several British feminist journals. The New Zealand government awarded her a pension in 1936 in recognition of her contribution to New Zealand literature. In 1939 the
New Zealand Society of Authors (PEN NZ) established the Jessie Mackay Poetry Prize and it has been awarded annually to a leading New Zealand poet ever since. it forms part of the
Ockham New Zealand Book Awards. Her poetry was included in a number of notable anthologies during her lifetime and in a 1956 anthology, but was omitted from the
Penguin Book of New Zealand Verse (1960) edited by
Allen Curnow. ==Activism==