Stephannie
Based on what i've heard around my site (columbia) people's gpa's have varied significantly. The highest I've heard when people are talking (which probably is no where near the highest actually) is something like 3.85 whereas the lowest I've heard was close to 3. A lot of it depends on your application essays, LORS, and your personal situation. Your best chance by far is to complete it by February 1st. Columbia had over 1000 applicants for only 80 slots so keep that in mind! Before I applied, I called all of the sites I was interested in and asked them what they looked at. I am white so that put me at a natural disadvantage to the program (I'm still under-represented) at some sights. When I called UCLA, they basically told me they wouldn't even consider me for the program. So I suggest talking to each program you want to go to and finding out what they stress for applicants. Each program is different!!