[1] Greenhills School is a member of the Michigan High School Athletic Association (MHSAA) and offers the following sports: The boys tennis team won the Division 4 Lower Peninsula state championship in 2003–4, 2006-7 and 2008-9 through 2015–16.

Since 2001, MHSAA has not crowned a true state champion in tennis, opting instead for separate tournaments for the Upper and Lower peninsulas.

[2] In 2017, the men's soccer team won the Division 4 state championship.

Jerry Tucker, a senior, scored the lone goal of the match to send the Gryphons to a 1–0 victory.

[1] Greenhills school has begun an expansion project planned to provide an additional 10,000 square feet (930 m2) of space.