Each state/school is different. I was told last year that September 1 was too late to apply for the Texas schools. In Texas they have 2 rounds, 1st and 2nd. By not having my app (DAT) in by the end of August I missed the 1st round. 99% of the class comes from the first rounds according to the Baylor Admissions people. The second round is just to catch a few "above average" apps that missed the cut... But this applies only to Texas.