gpa for rush

I'm a freshman and I want to rush a fraternity in the upcoming fall semester but I don't know the rules with GPA requirements. I've heard that you have to have a 2.5 to rush but I've also heard that a lot of frats only accept 3.0 or above. Does anyone know the GPA requirements for some of these frats that I might be interested in?
Delta Sig, ATO, Theta Chi.... Etc.