Johnson was born May 7, 1992 in Grand Forks, North Dakota. He is the son of Jennifer, who is in the United States Air Force, and Milton Johnson. He has four siblings -- Brandon, Lauren, Logan and Gabe. Johnson's favorite off-court hobby is cooking. In high school, he attended Saint Francis is Mountain View, California. He attended Fresno State for college. As a senior, he was named to the Mountain West All-Conference Second Team and the NABC All-District (17) Second Team.