The school or your private lesson teacher most likely owns one or even more. I went to a much smaller music school and there were 2 altos available to the students so and North Texas, I bet there will be at least a few available.

If you can't rent from the university (as the first poster said, contact the dept and ask), then you should be able to rent either from a music store at home, or one near campus.

Congrats on getting into music at UNT. They've got a good rep in music and in music ed, so you should be proud of yourself.

Check with their Music Department to see if one is available. Only someone who works there can answer this question.