Sheffield schools will have a fixed Easter break from 2018 following a public consultation on the issue.
The change in policy means pupils will have the first two weeks of April off, regardless of when Easter itself falls.
Schools will still close for the Easter bank holiday as usual but it will mean the half-terms in spring and summer are more even in length.
A consultation with parents and staff found more than 800 out of 1,200 respondents favoured the change.
Feedback from the consultation highlighted that long terms can lead to tiredness in children who then find it difficult to concentrate, Sheffield City Council said.
It added that shorter terms, which often happen with the traditional school calendar, do not give children necessary preparation time for their exams.
The change will apply to all community schools, voluntary controlled schools and community special schools.
Voluntary aided schools, foundation schools and academies will remain able to set their own term times but are being asked to support the new council model for the sake of consistency.