You might already know this, but there are many sides to being a warden. I've known many wardens, from California to Montana, New York, Oregon and some with the USFWS, and my background is in fisheries biology where you meet quite a few. In many states, budget cuts have really hampered the fish and game departments ability to do the traditional job of a game warden. In California, the department has been underbudgeted and understaffed for many years. Now they are shifting focus and have almost become anti-hunting. They have so many other responsibilities, much like the poster above mentioned, that your idea of a warden's job might not be reality in alot of places. Even if you found a traditional game warden's position without a college degree, remember that you are constantly coming in to contact with armed people who may or may not want to talk to you. Poaching, whether for fish, game or shellfish is serious business and the folks who do it can be very dangerous. In California and many other states, wardens spend alot of time dealing with pot growers and meth labs.
Montana is a place where a warden's job is still much the same as it always was. If you went to college first, you'd be way ahead of the game whether you stayed a warden or did something else. Go ahead and go west, but in my opinion, finish college first. It's tough to go back later. With the world the way it is, a degree in law enforcement could be a valuable degree to have if you like that work. Wildlife and fisheries management jobs are not plentiful and most of the jobs are with the government. Montana State in Bozeman has a great wildlife and fisheries program, and most likely has a program for enforcement.
Good luck,
Pete