Children must turn 5 before September 1 — in practice, on or before August 31.
Calculate for your child
The Arizona rule in detail
Kindergarten cutoff
Turn 5 by August 31
Who sets it
Set statewide
Legal basis
Ariz. Rev. Stat. § 15-821
School required from
Age 6 to age 16
Kindergarten mandatory?
No — kindergarten is optional
How Arizona compares
4 states use the same August 31 cutoff: Delaware, Kansas, North Carolina and Washington. 11 have an earlier cutoff and 29 have a later one, so a child born the same day can land a full grade apart depending on where they live.
28 states require school attendance to begin at age 6, Arizona among them. 11 states and DC start compulsory schooling earlier.
Like most of the country, Arizona does not mandate kindergarten — only 17 states and DC do.
Starting early in Arizona
A governing board may admit a child who has not reached the required age when it finds admission in the child’s best interest.
Early entrance is decided locally even where state law allows it, so ask your district office what evidence they expect and when the window closes.
Frequently asked
What's the Arizona kindergarten cutoff?
Children must turn 5 before September 1 — in practice, on or before August 31.
Who sets the kindergarten cutoff in Arizona?
Arizona sets one entrance date statewide, so it's the same in every district. The rule lives in Ariz. Rev. Stat. § 15-821.
Can a child start kindergarten early in Arizona?
A governing board may admit a child who has not reached the required age when it finds admission in the child’s best interest.
At what age is school required in Arizona?
In Arizona, school attendance is compulsory from age 6 to age 16. Arizona does not require kindergarten attendance; compulsory schooling starts at age 6.
Is kindergarten mandatory in Arizona?
No — kindergarten is optional in Arizona. School attendance is compulsory from age 6 to age 16.
Legal basis: Ariz. Rev. Stat. § 15-821. Cutoff, early-entrance and compulsory-age details cross-checked against the Education Commission of the States 50-State Comparisons (K-3 policies and compulsory school age).
Arizona Dept. of Education — verify cutoff with your local school district before relying on this page for enrollment.
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