Typically, a college semester consists of three months. However, the duration of a semester varies by state. The fall and spring semesters each consist of 15 weeks, although the summer semester is often shorter, lasting approximately 12 weeks.
A semester system divides the school year into two roughly 14- to 20-week semesters. The length of a semester varies from school to school by between one and three weeks. Some community colleges continue to employ the K-12 academic calendar, which consists of two 18-week semesters. Universities in the United States have two enrollment periods throughout the fall and spring semesters. The fall semester begins in late August or early September and concludes in December, whereas the spring semester begins in January and concludes in May. The summer semester runs from May to August.