Masonholder was the 26th head football coach for the Carroll College Pioneers (later "Carroll University") located in Waukesha, Wisconsin and he held that position for nineteen seasons, from 1982 until 2000. His career coaching record at Carroll College was 83 wins, 83 losses, and 0 ties. This ranks him first at Carroll College in total wins and 12th at Carroll College in winning percentage.
^National Collegiate Athletic Association; Intercollegiate Athletic Association of the United States; National Collegiate Athletic Association. Special convention (3rd : 1976). (1998). Yearbook of the National Collegiate Athletic Association (v. 92-93). The Association. Retrieved 2014-12-02.