I've always operated under the "Aquarium Rule" when it comes to pets in places I've rented. Ask if they allow aquariums, then I would always have a pet that lived within an aquarium. If they didn't directly specify fish, well then shame on them.
In my dorm room at Indiana University, I didn't have a roommate (thank the lord). And the only person who came in was the cleaning lady to clean the bathroom between my room and the other room every other week.
So I housed my aquarium critters in my closet. They had sliding doors, and nice wide shelves. I just made sure that on cleaning day my closet was closed and locked if I wasn't in the room. Which wasn't a problem as I didn't have classes on Tuesdays and Thursdays anyway.
I'd give it a month before bringing it to school with you, just to make sure if you had a roommate, they would be ok with it. And to also test out to see if your RA was a prick or not. Most of them don't care, but some of them think God himself appointed them to that position and they took glory in making your life hell. It'll also give you a period of time to work out where you would keep the snake, in what sort of container, and where you will store it's food. Some dorms don't allow microwaves nor mini-fridges, so you have to think about that aspect as well. If it's a busy dorm, I'd more than likely use a latching lidded Rubbermaid type of container. Those are easily overlooked in a dorm-type of environment.
You've got plenty of time to think about it yet. Just make sure you choose the college that's geared towards your academic interests rather than one who allows pets in the dorm.