After his playing days, he served as the head football coach at the University of Wisconsin–Madison from 1896 to 1902 and again in 1905, and at Georgetown University in 1903, compiling a career college football head coaching record of 73–14–1.

He was inducted into the College Football Hall of Fame as a player in 1962.

King's 1901 Wisconsin team went 9–0, outscored its opponents 317–5, and tied with Michigan for another conference title.

His 66 wins was the most of any head coach in program history until Barry Alvarez passed him in 1999.

This biographical article relating to a college football coach first appointed in the 1890s is a stub.