All colleges are required by law to have a Net Price Calculator posted on their website. The NPC on their site will tell you about how much it should cost you to attend that college. You can plug in arbitrary data at first, just to see during junior year, which you SHOULD do before you apply. Then senior year in October, after you fill out the FAFSA, you will have your actual EFC number (Expected Family Contribution) which you get after you fill out the FAFSA, and putting your EFC into the NPCs will tell you the likely cost of that college.
Hope this helps!