Most kids start kindergarten at age 5 , though the exact cutoff depends on the state or school district. In some places, children may start at 4 if they meet the cutoff date, and in others they may start at 6 depending on local rules and readiness.

Quick answer

  • Typical starting age: 5 years old.
  • Common cutoff: often by Aug. 31 or Sept. 1 , but it varies by location.
  • Compulsory school age: in many U.S. states, children must begin school by 5 or 6.

What to check

  • Your state’s kindergarten cutoff date.
  • Whether the school district allows early entry or has readiness requirements.
  • Your child’s social, emotional, and academic readiness.

Simple example

If a school district says a child must be 5 by Sept. 1 , then a child who turns 5 on Aug. 30 can start that year, while a child who turns 5 on Sept. 2 usually waits until the next year.

If you want, I can also help you find the kindergarten age rule for a specific state or country.