How many times has the University of Michigan played in the Rose Bowl?

20 Times (2004, 2003, 1997, 1992, 1991, 1989, 1988, 1986, 1982, 1980, 1978, 1977, 1976, 1971, 1969, 1964, 1950, 1947, 1901)

http://www.jhowell.net/cf/scores/Michigan.htm <--great resource on College Football