Transitional kindergarten · Diamond Bar

5 of Diamond Bar’s public and charter campuses ran a TK class in 2025–26, enrolling 197 four-year-olds.

Source: CDE 2025–26 October enrollment count, 5 campuses in Diamond Bar.

Quail Summit Elementary: 45 in TKMaple Hill Elementary: 39 in TKCastle Rock Elementary: 38 in TKGolden Springs Elementary: 38 in TKEvergreen Elementary: 37 in TK
  1. Quail Summit Elementary45 in TK
  2. Maple Hill Elementary39 in TK
  3. Castle Rock Elementary38 in TK
  4. Golden Springs Elementary38 in TK
  5. Evergreen Elementary37 in TK
Each numbered dot is a campus with a TK class, where it stands in the city. A larger dot has more children in TK. North is up.

Eligibility

Who can start TK in 2027–28?

Children who turn 4 by September 1, 2027 can start, and it’s free.

Age

Is my child old enough?

A birthday from September 2, 2022 through September 1, 2023 (our arithmetic from the rule). A child who turns 5 by September 1 starts kindergarten instead.

Rule: California Education Code § 48000 (opens in a new tab)

Cost

Does TK cost anything?

No. TK is a free public school year before kindergarten, and enrolling is optional. Hours, before- and after-school care and open seats vary by campus, so ask the school.

Starting ages and cutoff dates →

Where to enroll

Through 2 school districts

Campuses

Which Diamond Bar campuses have a TK class?

5 campuses in Diamond Bar had a TK class in 2025–26.

Campuses by TK headcount

Each campus’s TK headcount is from the state’s 2025–26 October enrollment count. Each Scope Score and percentile compares a school’s elementary grades with California elementary schools. A campus without elementary results shows none.

Each headcount counts the students enrolled on one October day, so it shows who enrolled, not seats open now. A campus missing here may still run TK; confirm with the school or district.

Before TK

Too young for TK? Where can my child go?

Diamond Bar has 27 licensed child care programs.

16

child care centers

11

family child care homes

A child born after September 1, 2023 isn’t old enough for TK in 2027–28. Until they are, look at Diamond Bar’s centers and family child care homes, and ask each one about ages and openings.

Preschools in Diamond BarPre-K vs TK vs preschool in California: a 2026 parent’s guide

Licensed programs from the California Community Care Licensing Division: child care centers as of August 13, 2026, family child care homes as of May 25, 2025. A license is not a quality rating or a current opening.