I was looking at a website for a kindy that I was interested in, and it said June 30 th is their cut off...

From thier site-
The Pre-prep groups are taught by a specialist early childhood teacher and a trained assistant.To be eligible to participate in a pre prep group, children must turn 4 by 30 June in the year they attend.*
He'll turn 4 the next day.

Ill check out that site Jellyfish, thanks!