Is Transitional Kindergarten mandatory?

No. TK is optional in every state we track. Parents decide whether their child attends TK, preschool, pre-K, or waits for traditional kindergarten.

Public TK programs are free, just like kindergarten. Private or parochial schools may charge tuition for a similar junior-kindergarten or early-fives program.

What happens after TK?

After completing TK, most children enter traditional kindergarten the following year. TK is designed as a single preparatory year, not a repeating grade.

Can my child go to TK if they already went to preschool?

Yes. Many children attend preschool at 3 or 4 and then enroll in TK the next year. Preschool and TK can complement each other.

How is TK different from repeating kindergarten?

TK is a distinct grade for younger children. It is not kindergarten repeated; it is an extra preparatory year before a child starts kindergarten.

The basics

What is Transitional Kindergarten (TK)?

Transitional Kindergarten — usually called TK — is a free public-school year designed for children who are old enough for school but not yet old enough for traditional kindergarten. It gives four-year-olds an extra year of early learning, social development, and academic readiness before they enter kindergarten.

What TK is (and who it is for)

TK sits between preschool and kindergarten. It is typically offered by public school districts, follows a school-day schedule, and is taught by credentialed teachers. The curriculum blends play-based learning with early literacy, math, and social-emotional skills so children are ready for the structure and academics of kindergarten.

TK is optional. Parents choose it when they want an extra year of maturity, social growth, or academic preparation for a child who will turn five shortly after the kindergarten cutoff.

TK age cutoffs and eligibility

Eligibility rules vary by state and district, but the general idea is the same: TK serves children who turn a certain age during the school year, but after the kindergarten birthday cutoff.

California TK example: Under California’s TK-for-all expansion, a child is eligible for Transitional Kindergarten for the 2025–26 school year if they turn four years old by September 1. This follows a phased rollout that expanded access annually until all four-year-olds became eligible.

Other states may use different names (pre-kindergarten, junior kindergarten, early fives, or 4K) and different birthday cutoffs. Always check your local district for the exact date.

TK vs preschool and pre-K

Preschool: Usually private, part-day programs for 3- to 5-year-olds. Focuses on socialization and early learning through play.
Pre-K: Often a school- or center-based program for 4-year-olds with more academic readiness focus.
TK: A public-school year, typically free, taught by credentialed teachers, and designed as a bridge to kindergarten.

What to expect in a TK classroom

TK classrooms look like a mix between preschool and kindergarten. Children may have circle time, centers, art, music, outdoor play, and short whole-group lessons. The day is shorter and more play-based than kindergarten, but it introduces routines, letter sounds, number concepts, and cooperative behavior.

Class sizes and adult-to-child ratios are often smaller than kindergarten, giving teachers more time to support early learners.

Frequently asked questions

Is Transitional Kindergarten mandatory?: No. TK is optional in every state we track. Parents decide whether their child attends TK, preschool, pre-K, or waits for traditional kindergarten.
Does TK cost money?: Public TK programs are free, just like kindergarten. Private or parochial schools may charge tuition for a similar junior-kindergarten or early-fives program.
What happens after TK?: After completing TK, most children enter traditional kindergarten the following year. TK is designed as a single preparatory year, not a repeating grade.
Can my child go to TK if they already went to preschool?: Yes. Many children attend preschool at 3 or 4 and then enroll in TK the next year. Preschool and TK can complement each other.
How is TK different from repeating kindergarten?: TK is a distinct grade for younger children. It is not kindergarten repeated; it is an extra preparatory year before a child starts kindergarten.