The International English Center provides an intensive English program especially designed for students who are preparing to enter a college or university in the United States. In the classroom, students learn English via a multi-skills approach, with classes in listening/speaking, reading, writing and grammar each day.  Students may also take elective courses that focus on improving certain language skills and learning specialized content. In addition to classes, the International English Center offers cultural, community and sports activities that allow the student to explore U.S. culture in a friendly and safe environment.

Because the IEC is part of the university, there are many opportunities to interact with its student population. IEC students join CU clubs, attend student festivals and public seminars and may visit a university class as part of an assignment or even enroll in a university class through the ACCESS program. Additional opportunities to interact with CU Boulder students include a conversation partner program through Swap at CU Boulder, and conversation clubs in partnership with various CU Boulder language departments.