text: We had K-5 which I thought was fine. K-3 seems... well, silly. Is there a big difference in 3rd graders and 4th graders? Not really. I would say stop at 4th or 5th. Just my opinion, though. And, the point you bring up about "school bond" is valid. My only issue: do you want a 6th grader on the same bus as a 1st grader? If a fight would occur.... This could be a problem.