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© 2026 PreschoolWise. Educational guidance, not legal or enrollment advice — always confirm with your school district.

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The basics

How old does a child have to be to start kindergarten?

In almost every state, a child must turn 5 years old by a set cutoff date to start kindergarten. The most common cutoff is September 1, but it ranges from July to as late as January — and a handful of states let local districts decide.

The cutoff at a glance

A child must turn 5 on or before September 1 to start kindergarten

September 1
J
F
M
A
M
J
J
A
S
O
N
D

Turns 5 by September 1

Starts kindergarten this school year.

Turns 5 after September 1

Waits until the next school year — a good fit for TK or pre-K.

The most common rule. Your state's exact date may differ — see the table below.

What age is kindergarten?

Kindergarten is for 5-year-olds. Because the cutoff is tied to a birthday, most kindergartners are 5 when school starts and turn 6 during the year. A child whose birthday falls just after the cutoff will be on the older side of their class the following year.

The year before kindergarten — preschool and Transitional Kindergarten (TK) — is for 3- and 4-year-olds building the skills kindergarten expects.

Kindergarten age cutoff by state

A child must turn 5 by each state's date to start kindergarten that year. Tap any state for its full pre-K and TK guidance.

StateMust turn 5 by
AlabamaOn or before September 1
AlaskaOn or before September 1
ArizonaBefore September 1
ArkansasOn or before August 1
CaliforniaOn or before September 1
ColoradoSet by local district
ConnecticutOn or before January 1
DelawareOn or before August 31
FloridaOn or before September 1
GeorgiaOn or before September 1
HawaiiOn or before July 31
IdahoOn or before September 1
IllinoisOn or before September 1
IndianaOn or before August 1
IowaOn or before September 15
KansasOn or before August 31
KentuckyBefore August 1
LouisianaOn or before September 30
MaineOn or before October 15
MarylandOn or before September 1
MassachusettsSet by local district
MichiganOn or before September 1
MinnesotaOn or before September 1
MississippiOn or before September 1
MissouriBefore August 1
MontanaOn or before September 10
NebraskaOn or before July 31
NevadaSet by local district
New HampshireSet by local district
New JerseyOn or before October 1
New MexicoBefore September 1
New YorkSet by local district
North CarolinaOn or before August 31
North DakotaBefore August 1
OhioSet by local district
OklahomaOn or before September 1
OregonOn or before September 1
PennsylvaniaSet by local district
Rhode IslandOn or before September 1
South CarolinaOn or before September 1
South DakotaOn or before September 1
TennesseeOn or before August 15
TexasOn or before September 1
UtahOn or before September 1
VermontOn or before January 1
VirginiaOn or before September 30
WashingtonOn or before August 31
West VirginiaBefore July 1
WisconsinOn or before September 1
WyomingOn or before August 1
District of ColumbiaOn or before September 30

Covering all 50 states + D.C.; 44 have a single statewide cutoff date, and the rest set kindergarten entrance age locally. Always confirm with your district.

What if my child just misses the cutoff?

If your child turns 5 just after your state's cutoff, they'll usually wait a year for kindergarten. That year is exactly what Transitional Kindergarten and public pre-K are built for — an extra year of early learning and social growth before kindergarten begins.

Frequently asked questions

How old does a child have to be to start kindergarten?
In most states a child must be 5 years old by a set cutoff date to start kindergarten. The most common cutoff is September 1, but it ranges from July to as late as January in a few states, and some states leave it to local districts.
What is the kindergarten cutoff date?
The kindergarten cutoff is the date by which a child must turn 5 to enroll for that school year. A child who turns 5 after the cutoff usually waits until the following year.
Can a 4-year-old start kindergarten?
Generally no — most states require a child to be 5 by the cutoff. A four-year-old who just misses the cutoff is often a good fit for Transitional Kindergarten (TK) or pre-K instead.
What happens if my child just misses the kindergarten cutoff?
If your child turns 5 just after the cutoff, they typically wait a year for kindergarten. That extra year is what Transitional Kindergarten and pre-K programs are designed for.
Rules change at the state line

See the cutoff and pre-K programs for your state

Get your state's verified kindergarten cutoff, TK rules, and free pre-K options on one page.

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