The recruitment schedule is not online yet (
http://www.dos.uci.edu/greeklife/) , but the sororities on campus are:
Alpha Chi Omega
Alpha Phi
Delta Delta Delta
Delta Gamma
Gamma Phi Beta
Kappa Alpha Theta
Kappa Kappa Gamma
Pi Beta Phi
There is also a Asian American sorority listed with the NPC groups. I do not know if they rush with the others (my guess is no??) but their name is Phi Zeta Tau.