The Montana High School Association had introduced a proposal to allow transgender teens to compete on a team that match their gender identity. However, due to lack of support, the proposal is being pulled. More on this below the squiggly.
Details can be found at the Flathead Beacon. But this is an issue that is being fought all across the nation. California, as in most things, paved the way in allowing transgendered teens to fully participate in society by not making them hide themselves just to play sports. Many states allow such things as well- even the Olympics!!
However there is still a fight to be had for these kids. Newspapers print transphobic ads. And religious "Christian" groups love to hate transgender individuals, especially kids. And of course Faux N* loves to push such filth.
So how can you help? If your school district district not have an inclusion policy letting transgender teens play as their identified gender, bring it up at your next school board meeting. Talk to you representatives. Have your local LGBT group help corridanate getting started.