What Age Does Preschool Start in California? 2026-27 Guide

Short answer: it depends which program you mean, and your kid's birthday decides most of it. Private preschool starts around age 2 and has no statewide cutoff. Head Start and California State Preschool (CSPP) open around age 3, add an income test, and still have age rules of their own. TK requires turning 4 by September 1, and that date has no exceptions. Kindergarten uses the same date to decide who starts in the fall, but a district can admit a younger child later in the year, case by case. It's one date doing two different jobs, and the difference matters if your kid's birthday lands in early September.

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The full age ladderThe exact 2026-27 birthday cutoffsWhy September 1 — and what if your kid's birthday is September 2?CSPP and Head Start: income matters most, but age still countsWhen to enroll: the December-January calendarWhat to do right now, by your kid's ageFrequently asked questionsThe bottom line

We already broke down what each of these programs actually costs and who's really running them in our full Pre-K vs. TK vs. preschool guide — this piece is just about the one question underneath all of it: how old does my kid have to be, and by when.

The full age ladder

Here's what's actually open to your kid, age by age, before we get to exact dates:

• Age 2: Private preschool, and not every center takes toddlers this young. CSPP is open to 2-year-olds too, but that's a temporary rule and it's up to the provider (more below).
• Age 3: Private preschool, plus Head Start or CSPP if your household qualifies on income (Head Start also has a few income-free doors — foster care, homelessness, public assistance — more below).
• Age 4: Everything above, plus TK — the year most people mean when they say "pre-K."
• Age 5: Kindergarten.

Private preschool, Head Start and CSPP don't run off one statewide birthday the way TK and kindergarten do. Most take applications year-round rather than in a single window, and CSPP and Head Start weigh your household income heavily. But none of them is age-blind. Each has its own age rule, and the table below has the specifics. The birthday math just gets much sharper once your kid turns 4.

The exact 2026-27 birthday cutoffs

This is the part worth screenshotting. For the school year starting fall 2026:

For 2026-27, that TK row means the usual incoming class was born between September 2, 2021 and September 1, 2022. The usual incoming kindergarten class was born September 2, 2020 through September 1, 2021. Those are the ordinary cohorts, not a ceiling. An older child who's new to the state, or who was held back a year, can be placed in either grade.

Both dates trace to the same statute. California requires a child to turn 5 by September 1 to start kindergarten, and TK inherited that exact date when Universal TK finished phasing in for 2025-26. Neither program lets a young child test in early on maturity or a readiness assessment. Kindergarten does carry one narrow exception, and it's worth knowing about if your kid's birthday sits just past the line. Data source: California Department of Education, Kindergarten FAQ and Transitional Kindergarten fiscal FAQs, current as of August 2026.

CSPP's 2-year-old window is worth flagging separately: it's not permanent. It runs through June 2027 and is up to the individual provider, so a 2-year-old CSPP seat isn't guaranteed even at a school that offers it.

Why September 1 — and what if your kid's birthday is September 2?

Every other date on the calendar works the way you'd expect. September 2 is the one that doesn't, and it lands differently on TK than on kindergarten.

For TK, it's a hard stop. CDE's Transitional Kindergarten fiscal FAQs answer this in one word. Can we enroll a student in TK who turns four after September 1? "No." Children who turn four after that date "are not eligible for enrollment in a TK program." No waiver and no readiness test gets a September baby in early.

For kindergarten, there's one narrow opening, and most families never use it. September 1 still decides who starts kindergarten in the fall. But under Education Code 48000(b), a district may admit a child on a case-by-case basis once that child has actually turned 5, partway into the school year. CDE's Kindergarten FAQ calls it "rarely used." The district decides whether to grant it, and the child still can't start at the beginning of the year. It's worth one phone call, but don't build your year around a yes.

So a kid who turns 4 on September 2 spends another year in whatever they're already doing — private preschool, CSPP, Head Start, or home — and enrolls in TK the following fall, when they're closer to 5 than 4. Redshirting usually means holding back a kid who's already eligible. This is the opposite situation: the calendar made the decision for anyone born in the first week of September, whether their family planned for it or not.

The date isn't arbitrary, even if it feels that way at 11pm googling "TK cutoff." It's also newer than parents assume. The law that moved it passed in 2010, but the cutoff itself stayed at December 2 through 2011-12; the phase-in started the following year — November 1 for 2012-13, October 1 for 2013-14, and September 1 from 2014-15 on. TK was created to catch the children that shift pushed out, and when TK went universal it kept the same September 1 line rather than inventing a new one. If you want the deeper argument over whether an almost-4-year-old belongs in a 24-kid TK classroom versus another year of preschool, that's covered in the redshirting section of our full guide.

CSPP and Head Start: income matters most, but age still counts

Because neither program uses TK's September 1 line, parents often assume they're age-blind. They aren't. Each sets its own age rule first, and then income decides who gets a seat among the children who clear it.

Head Start takes children who are at least 3, or who turn 3 by the date your community uses to decide public-school eligibility (45 CFR 1302.12). Income is only one of several ways in. A family of four at or below the federal poverty line — about $33,000 in 2026 — qualifies on income. So does any child in foster care, any child whose family is homeless — including families doubled up with another household, which can qualify under the federal McKinney-Vento definition of homelessness, worth asking the program about directly — and any household getting CalFresh, CalWORKs or SSI, whatever it earns. Programs can also seat a limited share of families above the line. Don't rule yourself out on the $33,000 number alone; one phone call settles it.

CSPP has statutory ages of its own. A child who turns 3 by December 1 counts as a 3-year-old for that program year, and a child whose third birthday falls on or after December 2 can enroll on or after the actual birthday (CDE's Pre-K age eligibility calculator will do the math on a specific birthdate). Two-year-olds are temporarily eligible through June 2027, at the provider's discretion.

On income, CSPP reaches much higher than parents expect. For 2026-27 the standard ceiling for a family of four is $136,044 a year, or $11,337 a month — 100% of the state median income. Above that, CDE's Management Bulletin 26-03 publishes a second ceiling of $13,038 a month, which works out to about $156,000 a year. CDE prints the monthly number; the annual figure is our own arithmetic on it. And that upper band, what the bulletin calls the 101–115 percent bracket, is capped at 10% of a contractor's contracted enrollment and enrolled last. Plan around $136,044 and treat the band above it as a long shot.

One more thing has changed in CSPP's favor: CSPP served about 41,000 fewer 3- and 4-year-olds in 2022 than it did in 2019, as free TK absorbed the 4-year-olds who used to fill those seats. That's the most recent comparison we found, not a live count, but it points the same direction: there may be more room in some communities, particularly for 3-year-olds. It doesn't mean a seat is waiting for you. Availability turns on your local contractor, its sites and schedules, and where your household lands in the priority order. Plenty of programs still run a waitlist.

Because both generally take applications year-round, there's no December deadline the way there is for TK and kindergarten — though it's worth checking with your specific contractor or grantee, since some run their own priority windows. They don't share an application, so knock on the right door. For Head Start, contact a local Head Start program directly. For CSPP, you apply to whichever contractor holds the contract near you. That's sometimes a school district, sometimes a county office of education, sometimes a community agency. Your county's child care resource & referral agency can tell you which one covers your address. The sooner you apply, the sooner you're on a list instead of behind one.

When to enroll: the December-January calendar

TK and kindergarten enrollment for fall 2026 doesn't open on one statewide date — every district sets its own window — but the pattern is consistent: winter, for the fall that follows. Sacramento City Unified opened TK and kindergarten registration together on January 13, 2026 for 2026-27. Garden Grove Unified opened its own portal a few weeks later, on February 4. Some districts start as early as December.

Here's the move: check your district's enrollment page in December, before the window opens, so you know the exact date. Missing that window usually costs you a choice of school rather than the seat itself, at least for TK: CDE says an age-eligible child can't be waitlisted out of a TK program. What isn't guaranteed the same way is the campus — the school-choice and open-enrollment round closes, and the popular campuses fill up with the families who registered on time, so a late registrant may land at a different school in the district than the one they wanted. You'll need proof of your kid's age (a birth certificate or an accepted substitute), proof that you live in the district, and immunization records. Commonly that's two residency documents, something like a lease or tax bill plus a utility bill — but the exact list is set locally rather than statewide, so check your district's list before enrollment week. TK kids need the same immunizations as kindergartners, not a scaled-down toddler version.

Head Start and CSPP don't share that calendar. Most programs take applications year-round, so missing "enrollment season" for TK generally doesn't cost you a shot at either of them — apply whenever your paperwork is ready, and confirm your specific program's timeline.

What to do right now, by your kid's age

If your kid just turned 2: Nothing urgent on a calendar. If you want group care, start touring private preschools, or ask your county's child care resource & referral agency which local CSPP contractors are taking 2-year-olds — that window closes in June 2027.

If your kid just turned 3: Check your household against both programs, and check the categories as well as the income. For Head Start, call a local program directly; a family of four under about $33,000 qualifies on income, and so does any household on CalFresh, CalWORKs or SSI, any child in foster care, and any family that's homeless, including families doubled up with someone else, whatever they earn — ask the program whether your situation qualifies under the federal homelessness definition. For CSPP, a family of four under $136,044 can apply through the local contractor — the resource & referral agency will tell you who that is. Over both lines, start pricing private preschool and ask every program you tour about sliding-scale tuition; it's more common than the posted price suggests.

If your kid turns 4 on or before September 1, 2026: Mark December on your calendar. Check your district's TK enrollment page then, so you're ready the day the window opens in January or February. If their birthday lands on September 2 or later, skip this — see the next line.

If your kid turns 4 on or after September 2, 2026: They're not eligible for TK this cycle, full stop. Plan for one more year of whatever's already working — preschool, CSPP, Head Start, or home — and revisit TK enrollment next December, for the fall after this one.

If your kid turns 5 by September 1, 2026: Same December-January window, same district portal, but for kindergarten. If they already did a year of TK, this is usually a formality; if they didn't, it's their first stop. If they turn 5 just after September 1, TK is the normal path for that year. If you have a reason to want kindergarten instead, ask the district about a case-by-case admission after the birthday, and expect the answer to be no.

Frequently asked questions

What age does preschool start in California?

Private preschool has no statewide start age — most centers take kids from 2 to 2.5. Some of those same centers take babies from six weeks, but that's licensed infant care, not preschool. Head Start and CSPP generally start at age 3, with an income test on top of their own age rules. TK is the one with a hard cutoff: your child must turn 4 by September 1 of that school year.

What age is TK in California for 2026?

For the 2026-27 school year, a child must turn 4 by September 1, 2026 to enroll in TK — meaning kids born between September 2, 2021 and September 1, 2022. There's no early-entry option for kids who turn 4 after that date; they wait for the following fall.

What age does kindergarten start in California?

A child must turn 5 by September 1 to start kindergarten in the fall. For 2026-27, the usual incoming class was born between September 2, 2020 and September 1, 2021 — the same cutoff date TK uses, one year later. There is one narrow exception: under Education Code 48000(b), a district may admit a younger child on a case-by-case basis once that child has turned 5, partway through the school year. CDE describes it as rarely used, it's the district's call, and the child can't start at the beginning of the year.

Is there an age cutoff for CSPP or Head Start?

Yes, just not TK's September 1 line. CSPP counts a child as a 3-year-old if they turn 3 by December 1; a child whose birthday falls on or after December 2 can enroll on or after the birthday, and 2-year-olds are temporarily eligible through June 2027. Head Start takes children who are at least 3, or who turn 3 by the date your community uses for public-school eligibility. Household income (or a qualifying category, for Head Start) then decides who gets a seat, and both generally take applications year-round rather than in one enrollment window — check with your specific contractor or grantee.

My kid's birthday is September 2 — what are my options?

None that get them into TK this year. CDE's TK fiscal FAQs say a child who turns four after September 1 is not eligible for a TK program, and there's no maturity or testing route around it. Your options are another year of private preschool, CSPP or Head Start (if you qualify), or staying home, and enrolling in TK the following fall. The case-by-case admission in Education Code 48000(b) applies to kindergarten, not TK, so it won't help a 4-year-old.

The bottom line

One date decides two of the five programs here, and it bends in exactly one place. If your kid turns 4 or 5 by September 1, 2026, TK or kindergarten is open to them for the coming school year — check your district's site in December so you're ready when registration opens. If they turn 4 after that date, TK is closed for the year and nothing reopens it. If they turn 5 after it, kindergarten is closed at the start of the year, and a district can still admit them later on a case-by-case basis, though CDE says that rarely happens. For CSPP, Head Start and private preschool, the calendar is looser but not wide open: each carries its own age rule, and then income, a qualifying category, or tuition decides the rest. For the full picture of what each program actually costs, who's teaching it, and what the classrooms are really like, the complete Pre-K vs. TK vs. preschool guide has the rest.