Schools require that your child be at least 5 by a predetermined cut off date--anywhere from the 1st day of school to November. If you call the administration office for your local school district they will tell you what the cut off date is. School districts will announce in your local paper when registration for Kindergarten will be held--typically it's the spring prior to the September start date.
My children have December/January birthdays, so they were 5 3/4 years old when they started Kindergarten.
at 9:31 AM on Feb. 26, 2011