depends on the program and a few other factors.
in general, schools have three criteria at their disposal, GRE scores, undergrad GPA, and letters of recommendation. For strong programs you need to have 3 of 3 strong. For middle programs then 2 of 3 is probably good. That said, for some programs, you also need to consider whether or not there is a good match between you and a likely advisor. Most advisors only have so many slots, especially for funding.
what are you going to study?