The purpose of the study is to evaluate the operational preparedness of senior high schools in Hagonoy, Bulacan. Hence, the study utilized the descriptive-evaluative method of research. School administrators, teachers, parents and students in the four public senior high schools in the municipality served as the respondents of the study. Accordingly, they responded to a set of adopted questionnaires based on DepEd Order no. 51, s. 2015 which details the guidelines in the implementation of the Senior High School (SHS) program. Findings showed that the senior high schools had "high" operational preparedness to implement the SHS program. However, further analysis also showed that the lack of learning materials and inadequacy of space for classrooms are the most common problems of school administrators in their implementation of the program. Therefore, the Department of Education (DepEd) must focus on providing these resources to schools to enhance the operational preparedness of the SHS program. In addition, the researcher strongly recommends the conduct of parallel studies to test the reliability of its results.