It is more difficult going through rush as a sophomore or junior. We always had a handful of sophomores and occasionally one or two juniors going through formal rush, but sadly, they tended to get cut heavily. There seemed to be an unspoken question - why didn't you join a sorority as a freshman?
We did bid a couple of juniors and a bunch of sophomores via informal rush, and they turned out to be some of the best additions to our chapter. So, juniors, don't lose hope