Urban Meyer
Dec 2004 - hired by UF.
Feb 2005 - 10th ranked class. 2 ***** (his), 10 **** (9 were his)
Jan 2006 - 10-3 record.Feb 2006 - 2nd ranked class. 6 *****, 9 ****. Most 5* committed after the first season under Meyer.
Charlie Weis
Dec 2004 - hired by ND
Feb 2005 - 29th ranked class. 0 *****, 5 **** (3 were his)
Jan 2006 - 9-3 record.
Feb 2006 - 5th ranked class, 3 *****, 12 ****. He had one 5*, five 4* committed before his first game as a coach.
Jim Harbaugh
Jan 2007 - hired by STAN
Feb 2007 - 43rd ranked class. 0 *****, 3 **** (1 was his)
Jan 2008 - 4-8 record (w/ colossal USC upset).
Feb 2008 - 44th ranked class. 1 *****, 3 ****. Luck, DeCastro, Howell (4*) committed before the season, Reuland after.
Brady Hoke
Jan 2011 - hired by UM.
Feb 2011 - 29th ranked class, 0 *****, 4 **** (2 were his).
Jan 2012 - 11-2 record.
Feb 2012 - 4th ranked class, 1 *****, 14 ****. All but two 4* committed before he coached his first game, plus two 5* for 2013.
For the sake of comparison to Butch rather than to Harbaugh (as he was never considered a similar coach)
Derek Dooley
Jan 2010 - hired by UT.
Feb 2010 - 17th ranked class, 1 ***** (his), 7 **** (1 was his).
Jan 2011 - 6-7 record.
Feb 2011 - 10th ranked class, 0 *****, 9 ****. Most of their top kids committed after the season began.
Butch Jones
Dec 2012 - hired by UT.
Feb 2012 - 36th ranked class, 0 *****, 4 **** (3 were his, incl North, Dobbs).
Jan 2013 - 5-7 record.
Feb 2013 - 4th ranked class, 0 *****, 17 ****. About 50/50 in terms of committing before Butch coached his first game at UT.
Jim Harbaugh
Dec 2014 - hired by UM.
Feb 2015 - 35th ranked class, 0 *****, 7 **** (3 were his)
Jan 2016 - ??? record
Feb 2016 - ???
Class so far - 14 verbals, 0 *****, 6 ****, 6 ***, 3 **/NR
Jimbo Fisher had a lot of early success in recruiting, though he had been there for years as an assistant, so that's not a great example.
Same with Dabo Swinney.