The Montana High School Association (MHSA) is the governing body of high school athletics in the U.S. state of Montana. It was founded in 1921 and today consists of 180+ member schools.
The MHSA divides schools based upon their total enrollment for all activities. As of 2023, the enrollment criteria for each class is: 801 and up for Class AA, 301-800 for Class A, 101-300 for Class B and 1-100 for Class C. Further divisions may occur geographically, which varies depending on the activity. However, tournaments to crown state champions solely use class divisions.
Western AA
Eastern AA
Northwestern A
Southwestern A
Northeastern A
Southeastern A
The MHSA oversees all of the following activities of its constituent schools.
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<sup>*</sup> Beginning in the 2003-04 school year, Class AA and Class A switched golf from a spring sport to a fall sport. Thus all Class AA and Class A championships since then have been awarded in the fall, while all Class B and Class C championships have continued to be awarded in the spring.
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<sup>*</sup> Beginning in the 2003-04 school year, Class AA and Class A switched golf from a spring sport to a fall sport. Thus all Class AA and Class A championships since then have been awarded in the fall, while all Class B and Class C championships have continued to be awarded in the spring.
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<sup>*</sup> Beginning in the 2002-03 school year, girls volleyball switched seasons from winter to fall. Thus there were two girls volleyball champions crowned in the 2002 calendar year per class, one for each separate school year. This coincided with girls basketball switching seasons from fall to winter.
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