A college semester generally lasts approximately 15 weeks. This may vary from institution to institution based on factors such as holidays, exam schedules, and other local or state issues.
It's important to check the academic calendar for a particular college or university for the specific beginning and ending dates for a semester. Institutions on a semester system hold fall and spring sessions. Additionally, they may offer short, concentrated sessions during the winter and summer breaks. The final week of each semester is generally devoted to final exams, and some time on the semester calendar is allotted for instructors to complete their administrative tasks related to posting grades.