Too early? I wouldn't think so. I've already been to a couple, talking to recruiters and all, and I don't graduate until next spring. Although a number of recruiters weren't actually hiring for positions this early, I've been keeping in touch with some of them, and already have business cards & contacts if the first choice ones fall through.
When I went I was specifically asking recruiters if they hire new grads into my areas of interest, and what their new grad orientation programs were like. My focus was a good orientation, at a busy hospital where I would see & learn alot. I asked about length of orientation, type of preceptor (one or several), classroom time or just floor orientation, do they help pay for certs or continuing ed classes. And I also wanted to know about their reps with new grads. How long have they had a new grad program (don't want to be the guinea pig), how many new grads do they take a year, continuous intake or limited to a couple of times a year, how many of their new grads complete the orientation, how many new grads from last year have stayed and are still working there. Also, for the programs that interested me, I asked them to tell me about their unit. What are common dx, RN responsibilities, pt ratios, etc.
I'm young, so the other stuff wasn't such a biggie for me: shifts/hours, pay, benefits, etc.
Why not go now, even if you think it's early??? Just remember to bring a copy of your resume & cover letter with you. If there not hiring for a job now, they might be soon!
Best of luck!