Good question. It is never to early to start an internship while in college or at least to start to look for internships that interest you and that make sense for what you would like to do after school. Too many students wait until the last minute to find/do an internship that they either miss out entirely or they have a bad experience because they were forced to do something that didn't make sense for their major or didn't enjoy.
An internship is mainly used to help people get a taste of the industry as well as to build experience up for your resume and you can never start too early with that. Give yourself a competitive edge and start to at least look at internships as a freshman. Make sure you don't put too much on your plate though, enjoy your time at school as well as give adequate time for classwork, social life, etc.