Born on 10 December 1978, Summer Joy Phoenix is the fifth and youngest child of Arlyn Phoenix and John Bottom, a carpenter. Summer was raised in Southern California, but spent her teen years in Central Florida, where she was born. She is an active supporter of numerous charities and activist groups, mainly concerning the environment, animal rights and vegetarianism. Summer has also appeared in many print ads in Europe.
Summer was married to actor Casey Affleck. She filed for divorce in July 2017.