mom, I fully empathize with your position. Montana does not have HS baseball either. But take heart! It can be done. Both of my sons went on to play in college.
The key thing you need to understand is that NO ONE is going to come to find you. That simply means that you are going to have to "go to them" if you want to make something happen. You have a couple of years yet to line up your ducks. The summer between his junior and senior year is the most critical time.
A solid JR College program is the Jayhawk league in Kansas. 19 schools in all, split between East & West. Go to the individual schools websites and see what is available in the way of winter showcases and summer camps. The University of Kansas also puts on an All-star camp the first week in August. Modeled after Stanford's camp, they bring in college coaches from around the country to assit. It was a great experience for my son who wound up in the Jayhawk League.
My other son got his best exposure from the Northwest Championships put on by Baseball Northwest. If I'm not mistaken, they now include a team from Wyoming as well. You can check out their website as well,
www.baseballnorthwest.com .
It can be done for someone in your son's situation, but you need to be prepared (time and budget wise) to do more than what is required in areas where baseball is stronger. I would reiterate, they are not going to come to you, so you will have to go to them. Tell your son to work hard, and good things will happen.