Service-learning experiences have the potential to improve participants' attitudes and values toward those whom they serve, but if the experience is poorly designed or poorly implemented, it runs the risk of reinforcing stereotypes and deficit perspectives of the intended beneficiaries of service. This study examines the extent to which Contact Theory predicts the efficacy of service-learning courses in promoting positive attitude change among participants. Contact Theory stipulates the conditions under which attitude change toward an "out-group" becomes possible. Comparing pre-test and post-test scores for 220 students enrolled in service-learning courses in two different institutions, we find that courses that reflect more tenets of Contact Theory are more effective than those less aligned with Contact Theory in reducing students' overall colorblindness and improving their awareness of blatant racial issues.