The five teaching unions have “implored” the first and deputy first minister to set a date for schools to close.
In a joint letter the unions said Arlene Foster and Michelle O’Neill should “act immediately.”
“We call on you to bring an end to this uncertainty by announcing the date for school closures,” the letter said.
The Education Minister Peter Weir has said Northern Ireland’s schools should remain open for now.
Mr Weir added he would follow “expert clinical advice” in making any decision to close schools.