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1999. 11th ranked Spartans defeated the 4th ranked Wolverines 34-31 in East Lansing.
They are 8th in all-time wins. Michigan is 1st.
1995
2011
1965-1967.
2002-2007.
1959-1962
September 27, 2014 vs. Minnesota.
Penn State was last ranked in football during the 2011 football season. During Week 14, the last poll prior to the bowl season and the following "Final" polls, Penn State was ranked in both the AP (No. 24) and Coaches' (No. 23) polls. After losing their bowl game, the Nittany Lions were unranked in both final polls.
Michigan defeated USC by a score of 22-14 on January 2, 1989 during the 1989 Rose Bowl Game.
Prior to the 2008 season, that was November 6, 2007 when Central Michigan defeated Western Michigan 34-31.
Satorday Saturday, November 13 @ Purdue