The existence of the achievement gap is more than just a black–white issue; contrary to stereotypes, it is a concern within Asian homes. Hmong students underachieve in comparison with many East Asian students. Traditional cultural practices and poverty have been identified as explanatory factors. Our data suggest that a more critical factor might be within-school segregation. Utilising a racial exposure statistic, it was found that the more diverse a school became, the higher the achievement of Hmong limited English proficient (LEP) students. This study provides theoretical explanations for this finding and implications for Hmong student achievement.