Mothers of 110 children with autism spectrum disorders (ASD) were interviewed with the Child and Adolescent Impact Assessment when their children were approximately 9 years old. Regression analyses revealed that African American mothers reported lower levels of perceived negative impact of having a child with ASD than did Caucasian mothers. Higher repetitive behavior scores on the Autism Diagnostic Interview-Revised, lower adaptive behavior scores on the Vineland Adaptive Behavior Scales, and less perceived social support were also significant predictors of higher perceived negative impact. Identifying predictors of perceived negative impact is an important first step in designing interventions to support families and target parents who may be at risk for experiencing higher levels of stress.