The Montana High School Association (MHSA) is the governing body of high school athletics in the state of Montana.

The MHSA divides schools based upon their total enrollment for all activities.

However, tournaments to crown state champions solely use class divisions.

[12] † Co-Champions * Beginning in the 2003-04 school year, Class AA and Class A switched golf from a spring sport to a fall sport.

This coincided with girls basketball switching seasons from fall to winter.