Learning a language involves knowledge of both linguistic competence and cultural competence. Optimal development of linguistic competence and cultural competence, however, requires a high level of acculturation attitude toward the target language culture. To this end, the present study explored the acculturation attitudes of 70 Iranian undergraduate students of English as a Foreign Language, following a one-semester academic sojourn in the United States. The data of the study were collected through a 29-item 5-point Likert scale acculturation attitude questionnaire. Findings indicated that sojourners tended to have close contact with the people of the target society while maintaining their original culture, adopting Integration and Assimilation strategies as their acculturation attitudes. The pedagogical implications of the findings suggested providing opportunities for students of English as a Foreign Language to immerse in the target language culture through organizing academic exchange programs.