High school admissions typically end by the end of the summer before the student's freshman year. This timeline allows schools to finalize their incoming class and prepare for the new academic year. According to the National Center for Education Statistics (NCES), the majority of high schools in the United States have admission deadlines that fall between March and June. The specific end date can vary depending on the school district, state regulations, and the type of high school (public, private, magnet, etc.). For example, public schools often have a later deadline compared to private institutions, which may have rolling admissions or earlier deadlines. The National Association for College Admission Counseling (NACAC) reports that approximately 70% of high schools have a deadline between March and June, with a significant number of schools accepting applications on a rolling basis. This timeline ensures that students have ample time to complete their applications, secure necessary documentation, and meet any financial aid requirements.