You could try spring rush, but you limit your choices when you try informal recruitment instead of formal because you never know who will be participating (or if anyone will) and you don't get the opportunity to meet all the houses.
Would I be better off waiting until next year, or just go ahead and try spring rush? I realize it'll be harder with most sororities not participating, but as a freshman with a (hopefully) higher GPA rather than a sophomore be a better situation?