I'll be in the English department. I was checking craigslist daily. It took some time, because I had fairly specific criteria (i.e. house, larger, close to campus, allows pets) to accomodate my significant other and me. If you're moving by yourself, or if you don't have a so many criteria, it should be really easy to find a place. Right now people are advertising for openings in June, July, and August. I also googled "College Station rentals" and used links from the grad housing area of tamu.edu.