Best Daycares in Diamond Bar, CA

How we ranked these Diamond Bar daycares

This ranking is built from public licensing records, not from opinions or paid placements. Every center on this page is pulled from the state licensing database, and the order is decided by three objective signals applied in this exact sequence:

1. Current license status first. Centers whose permit is on record as licensed appear above those with any other status. A license is the single strongest signal a state gives you.
2. Licensed capacity, largest first. Bigger licensed capacity usually means more classrooms, more age groups served and a better chance of an open spot — but it is not a measure of quality, and a small center may suit your child better.
3. Most recent inspection date. A center inspected recently has fresher public data behind it, so what you read here is closer to today's reality.

What this list cannot tell you. Licensing data says nothing about staff turnover, how a room feels at 4pm, or whether a director answers the phone. Those you can only learn by visiting.

Before you enrol anywhere, verify the license yourself in your state database, tour during operating hours, and ask for the ratio in your child's specific room — our 30-point tour checklist walks through exactly what to ask.