The pre-school I attended when I was young had its own kindergarten. I stayed there for kindergarten and then went to public school for 1st grade.
LO's current school goes through age 6 (Montessori). We have a lot more research to do before deciding what kind of school she'll be attending (the public schools in this area have mixed opinions).
My feeling now is that I want to get her into the public school setting in kindergarten so she can get used to it. But I'll be sad to take her out of the Montessori program because I do like it and believe in the methods. There don't seem to be any Montessori schools that go passed age six near us. There are some closer to the major city we live near, but it would be too far for daily school.
What did you do? Keep them at the same school as long as possible or send them to a new school once they were kindergarten age?