Moon grew up in Los Angeles, California, as the middle child amongst six sisters. In pursuit of higher academic standards, Warren used the address of one of his mother's friends to gain advantage of a suitable academic and athletic reputation than that of the local neighborhood high school. He could play only one sport in high school because he had to work the rest of the year to help the family. After figuring out that he could throw a football longer, harder, and straighter than anyone he knew. Warren dedicated himself to becoming the best quarterback he could become. A number on college teams wanted to convert Moon to another position but he eventually made his way to University of Washington, via West Los Angeles College. After not being drafted by the NFL, Moon signed with the Edmonton Eskimos, leading Eskimos to an unprecedented five consecutive Grey Cup victories in 1978, 1979, 1980, 1981, and 1982. In 2001 he was inducted into the Canadian Football Hall of Fame and the Edmonton Eskimos Wall of Honour. Moon would later enjoy NFL success 9 Pro Bowl games, passing for over 4,200 yards in first two seasons with Vikings. At the time of his retirement,Moon was in the top five all-time when in passing yards, passing touchdowns, pass attempts, and pass completions.