Most college campuses are not comfortable places for people to be openly conservative. My school would not make a top 10 list of most liberal campuses, but it would definitely take more confidence to bring up conservative ideas than liberal ones.
That said, I can’t help but be offended by the idea that a college student is likely to be “indoctrinated”. Indoctrination, by definition, compells people to accept a set of beliefs uncritically. If you are worried about your 18 yo son or daughter getting “indoctrinated” you might have done something wrong. My mom taught me to think.