CUPE says if there is no real movement by the end of the day, the union may be in a legal strike position in 17 days.
Contract talks between education workers and the province have reached an impasse.
The Canadian Union of Public Employees says if there is no real movement by the end of the day, a "no board" report will be requested.
If the report is issued by a conciliator, the union will be in a legal strike position in 17 days.
The union represents 55,000 education workers in Ontario, including custodians, librarians and early childhood educators.
Laura Walton, president of CUPE’s Ontario School Boards Council of Unions, has not said if workers will go on strike or participate in a work-to-rule campaign if they end up in a legal strike position.
The province has offered raises of two percent a year for workers earning less than $40,000, and 1.25 percent for all other workers.
CUPE is asking for annual increases of 11.7 percent.
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