1. Fall Semester: This semester typically begins in August or September and ends in December or January.
2. Spring Semester: This semester begins in January or February and ends in May or June.
Each semester is usually around 16 to 20 weeks long and includes a final exam period at the end.
It's worth noting that the specific dates of the semesters may vary slightly from school to school or may be adjusted in certain circumstances, such as during the COVID-19 pandemic when some institutions adopted alternative academic calendars.