[2] Mill Valley is a member of the Kansas State High School Activities Association and offers a variety of sports programs.

The second expansion of the school building follows a prior extension of the "A" hallway including the construction of a dedicated art wing.

[citation needed] A second expansion occurred in 2019–20, resulting in a new theatre, fieldhouse, gym, a total of nearly 60,000 square feet of new space.

During the 2015–2016 school year, Mill Valley created the Symphonic Band, an audition-only ensemble for upper-level musicians.

Starting in 2024, the team began hosting the Heartland Regional at Mill Valley High School.

Mill Valley offers the following sports: baseball, basketball, bowling, football, golf, soccer, tennis, cheerleading, cross country, dance team, softball, track & field, volleyball, swimming, and wrestling.

[citation needed] Both of Mill Valley's other publications, the 2006 JAG yearbook and the JagWire newspaper, won second place at the National High School Journalism convention, for best of show.

The 2009 JAG is also a recipient of the National Pacemaker Award, widely considered to be the "Pulitzer Prize of student journalism.

"[citation needed] In fall of 2011, the JagWire launched the website MV News.org and publishes web exclusive content daily.