This study aims to investigate the foreign language anxieties Japanese international students at American universities have and the relationship between these anxieties and length of stay in the U.S. 151 Japanese international students answered a modified version of the Foreign Language Classroom Anxiety Scale (Horwitz, Horwitz & Cope, 1986) followed by demographic questions. The findings from the questionnaire were analyzed through SPSS 21 software. Results indicated a statistically significant relationship between students’ level of anxieties and the length of stay in the U.S. Implications for teachers and government officials in Japan, as well as for teachers and university administrators in the U.S., are discussed.