Grant Fisher was born in Calgary, Alberta, on 22 April 1997 to Dan and Sonia Fisher. He has an older sister, Hailey, and a younger brother, Mark. He currently lives in Grand Blanc, Michigan and attends Stanford University in Palo Alto, California. In addition to running, Fisher is an avid soccer player. He began playing the sport when he was four years old and in high school was a member of the Michigan Wolves, an elite level club team.