Keighley-district schools are among several being forced to shut due to strike action by teachers.
Aire View Infants School in Silsden and Cullingworth Village Primary School have already announced they will be closed next Wednesday, March 26.
And Holycroft Primary School in Keighley will only partially open.
The National Union of Teachers, which is striking over pay and conditions, warns that more schools face closure that day.
Spokesman Ian Murch said: "We have members in every Bradford district school so I think most will be affected to some extent.
“The schools have to make their own decisions to close but I think quite a lot of secondary schools will. Some primary schools may just have a class or two shut for the day."
He said teachers had experienced a three-year pay freeze as well as facing a rising retirement age.
Mr Murch added: "None of these things are good for parents. They wouldn't want the people who teach their children to be in the classroom until they are 68.
"Schools already have difficulty in recruiting teachers in maths and English and if pay is kept down and teachers are unhappy that is going to get worse."