If your child just misses the kindergarten cutoff, you have probably heard about TK. Here is what it is, who it serves, and how to tell it apart from pre-K.
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Transitional kindergarten (TK) is a free, publicly funded grade between preschool and kindergarten for children who are slightly too young to start kindergarten. Offered mainly in California, it gives younger 4-year-olds a school-based year of early learning, taught by credentialed teachers on a public-school campus before they enter kindergarten.
TK is a grade, not a daycare. It runs inside the public school system on a regular school-year calendar, with credentialed teachers and an early-learning curriculum, per the California Department of Education. Children attend their local elementary school, and the day looks like a gentler, play-rich version of kindergarten built for younger learners.
Because TK is public school, it is free during the school day. California has been phasing in TK for several years and, in the 2025-26 school year, extended eligibility to every child who turns 4 by September 1, per the California Department of Education. That makes TK the backbone of the state's universal prekindergarten effort. A few other states run smaller transitional or "young 5s" programs under their own names and rules.
Eligibility comes down to a birthday and your state. TK was designed for children whose birthdays fall just after the kindergarten cutoff, so they get a developmentally suited year first. In California, the eligible age window widened each year and reached all 4-year-olds (turning 4 by September 1) in 2025-26, per the California Department of Education.
| Question | How TK generally answers it |
|---|---|
| Where is it offered? | Public elementary schools; most widespread in California |
| Typical age | 4-year-olds, often those born just after the kindergarten cutoff |
| Who teaches | Credentialed teachers, on a public-school campus |
| Cost of the school day | Free (publicly funded) |
| Is it required? | No — optional, one path among several |
Outside California, the picture is uneven. Some states fund public pre-K instead of a TK grade, some offer a "young fives" classroom, and many offer neither. If you are not in California, check whether your district uses the term at all before you count on it, per local school-district guidance.
They overlap, but they are not the same. Pre-K and preschool are broad terms for the year or two before kindergarten, delivered in private centers, Head Start, and public programs. TK is a specific public-school grade for children who are a little too young for kindergarten, taught by credentialed teachers, per the California Department of Education.
The practical difference is setting and price. A private preschool charges tuition and sets its own calendar; TK is free and follows the public-school year. For a side-by-side, see our guides to preschool vs transitional kindergarten and daycare vs TK, and our explainer on pre-K vs preschool.
The TK school day is free because it is public school, per the California Department of Education. The cost most families actually face is wraparound care: the hours before and after the school day, plus school breaks, when working parents still need coverage. That care is paid, and prices track local daycare and after-school rates.
There is a tax angle worth knowing. Paid before- and after-school care that lets you work can count toward the federal Child and Dependent Care Credit under IRS Publication 503 (2024), even when the TK day itself is free. To see how a bridge year fits your wider budget, our daycare cost guide lays out typical ranges by age and city.
The honest tradeoff. TK is a strong deal where it exists — a free, credentialed school year for a young 4-year-old. But it is uneven across the country, the eligibility cutoff shifts year to year, and the school-day hours rarely match a full work schedule. Confirm this year's rules with your district, and plan for wraparound care before you assume TK covers your day.
Is TK academic or play-based? It is built to be developmentally appropriate for younger children, blending play with early literacy and math, in line with NAEYC guidance (2022). It is gentler and more play-rich than a typical kindergarten classroom.
Will my child repeat kindergarten after TK? No. TK is the year before kindergarten, not a substitute for it. Children finish TK and move on to kindergarten the next year, per the California Department of Education.
Can I choose private preschool instead? Yes. TK is optional. Some families prefer a private preschool's hours, philosophy, or location and skip TK entirely. Compare the tradeoffs rather than defaulting to the free option.
Transitional kindergarten is a free public-school grade that gives younger 4-year-olds a developmentally suited year before kindergarten, most widely available in California, per the California Department of Education. If your child just misses the kindergarten cutoff and TK is offered near you, it is worth a serious look — just confirm this year's eligibility and line up wraparound care for the hours school does not cover.
What "universal" really means, and where free pre-K is offered.
Read the article → Sibling spokeHow a private preschool year compares with a free TK grade.
Read the article → Pillar guideWhat care costs by age and city, including wraparound hours.
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