Blashill was born in Detroit, Michigan and raised in Sault Ste. Marie, Michigan, where his father Jim was a professor at nearby Lake Superior State University. Jim had originally worked as a police officer in Detroit and served as a professor of criminal justice at LSSU for over 30 years. Blashill is married with three children. Jeff's brother, Tim Blashill, also played and coached college hockey. Tim currently coaches high school hockey in Big Rapids, Michigan, and also serves as program coordinator for Ferris State University's Ewigleben Arena.
