Ripon College joined the conference in 1923, followed by Monmouth College in 1924, Grinnell College in 1940 and Lake Forest College in 1974. Illinois College and St. Norbert College joined in 1982 and Carroll University followed in 1992. Carleton withdrew following the 1982–83 academic year. St. Olaf College also competed in the conference from 1952 to 74, as did the University of Chicago from 1976 to 1987. Coe and Cornell withdrew following the 1996–97 academic year with Cornell rejoining the league starting in the 2012–13 year. Macalester College joined as a football-only member starting in 2014. The University of Chicago returned as a football-only member in 2017, and added baseball to its conference membership in the 2019 season (2018–19 school year).