The Chicago Teachers Union says its members will go on strike Monday for the first time in 25 years.
The union says contract talks with the district failed late Sunday night over issues including benefits and job security.
More than 26,000 teachers and support staff are expected to hit the picket lines, while the school district and parents make plans for keeping students safe and occupied during the day.
The walkout comes after months of tense negotiations between Mayor Rahm Emanuel, the school board and union leaders at a time when unions and collective bargaining have come under criticism around the nation during difficult economic times.
District officials have made plans to feed and monitor students at 144 schools throughout the city during the strike.
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