To start regular kindergarten in California, a child must turn five on or before September 1 of that school year. That is the California kindergarten age requirement set by state law, and districts have no discretion to turn away a child who meets it. Children who miss the September 1 cutoff are eligible instead for Transitional Kindergarten, which as of the 2025–26 school year is open to every four-year-old in the public school system.
The September 1 Cutoff
California Education Code Section 48000 sets a single bright-line rule: a child may enter kindergarten if they will turn five on or before September 1 of the school year.1California Legislative Information. California Education Code EDC 48000 A child whose fifth birthday falls on September 2 or later is not eligible for regular kindergarten that year, no matter how ready the parents believe the child is.
Districts must admit any child who meets the age requirement, whether at the start of the year or upon transferring in later.2California Department of Education. Kindergarten in California The rule is the same in every California public school.
If Your Child Misses the Cutoff: Transitional Kindergarten
Transitional Kindergarten is the first year of a two-year kindergarten experience, using an age-appropriate curriculum designed to bridge preschool and regular kindergarten. California phased in TK eligibility over more than a decade, and the expansion finished with the 2025–26 school year.
Beginning in 2025–26 and continuing in 2026–27, any child whose fourth birthday falls on or before September 1 of that school year is eligible for TK at their local public school.3California Department of Education. Universal PreKindergarten FAQs Eligibility does not depend on family income, background, or zip code.4California Department of Education. Transitional Kindergarten FAQs – Instructional Time and Attendance
TK classrooms are smaller than regular kindergarten. State law caps average TK enrollment at 24 students per school site and requires an adult-to-student ratio of one adult for every 10 students beginning in 2025–26.4California Department of Education. Transitional Kindergarten FAQs – Instructional Time and Attendance TK teachers must also hold an Early Childhood Education credential, a requirement that took effect August 1, 2025.
TK is free and voluntary. It is not a prerequisite for regular kindergarten. Parents who prefer private preschool, a home program, or another year at home can choose those options. For families looking for a no-cost public school placement for a four-year-old, though, Universal TK is now the default path.
Can My Child Start Kindergarten Early?
California allows early admission for children who fall just short of the September 1 cutoff, but the decision belongs entirely to the local school district. The California Department of Education has no authority to require any district to admit an underage child.2California Department of Education. Kindergarten in California
Under Education Code Section 48000(b), a district may admit a child on a case-by-case basis, but attendance cannot begin until the actual date of the child’s fifth birthday. Some districts weigh test results, developmental maturity, or preschool records. Others do not offer early admission at all. If a district allows early entry and the child continues past the anniversary of that admission, the school must have a signed Kindergarten Continuance Form on file.2California Department of Education. Kindergarten in California Contact your district office directly, because policies vary widely and are not set at the state level.
Is Kindergarten Required in California?
No. Compulsory education in California begins at age six and continues through age eighteen under Education Code Section 48200.5Justia Law. California Education Code 48200-48208 – Article 1. Persons Included Parents can legally keep a child home until age six with no truancy consequences. Most families enroll at five, but the law does not require it.
Once a child turns six, enrollment is mandatory. At that point the district and the parents together decide whether the six-year-old starts in kindergarten or first grade.6California Department of Education. Kindergarten Frequently Asked Questions Families who intentionally delay kindergarten by a year, sometimes called redshirting, are not penalized under California law, provided the child is enrolled by age six.
First Grade Age Requirements
Education Code Section 48010 mirrors the kindergarten rule one year up: a child must turn six on or before September 1 to be eligible for first grade admission.7California Legislative Information. California Education Code 48010 A child who turns six after September 1 can still enroll in school that year, but the placement between kindergarten and first grade is a local decision made with parental input.6California Department of Education. Kindergarten Frequently Asked Questions
Quick Reference by Birth Date
For the 2026–27 school year, a child’s birthday determines placement this way:
- Born on or before September 1, 2021: eligible for regular kindergarten, since the child turns five by September 1, 2026.1California Legislative Information. California Education Code EDC 48000
- Born September 2, 2021 through September 1, 2022: eligible for Transitional Kindergarten, since the child turns four by September 1, 2026, but does not turn five until after the cutoff.3California Department of Education. Universal PreKindergarten FAQs
- Born after September 1, 2022: not yet eligible for TK or kindergarten in 2026–27.
If you are unsure about placement or want to ask about early admission, contact your local district office well before the school year starts. Enrollment timelines vary, and many districts open registration in the spring for the following fall.