The exact date at which children become eligible is set down in law.
Children whose 3rd birthday falls between 1st March and 31st August become eligible for a free place from the autumn school term following their birthday (usually beginning in August).
Children whose 3rd birthday falls between 1st September and 31st December become eligible for a free place from the spring school term following their birthday (usually beginning in January).
Children whose 3rd birthday falls between 1st January and the last day of February become eligible for a free place from the summer school term following their birthday (usually beginning in April).
As education authorities can provide additional weeks if they choose to, some may offer a place earlier – from the date of a child’s third birthday for example.