The deal for teachers in Zion-Benton District 126 was reached at approximately 2 a.m., after 11 consecutive hours of negotiations, according to an attorney for the district.
The news is a big relief for school administrators and parents. Students have been out of school for three days because of the strike.
The teachers union is expected to vote officially on the agreement later Tuesday. If approved, nearly 3,000 students will head back to class Wednesday.
Teachers have been on strike since last Thursday. Key issues in the negotiations have been salaries and the cost of health insurance.
Teachers and other employees have been working without a contract since July.
An attorney speaking with ABC7 Chicago early Tuesday would not elaborated on details of the tentative agreement.
Attempts to obtain comments from members of the teachers union were also unsuccessful.
ABC7Chicago.com will update this developing story as more information becomes available.