There is mounting evidence that maternal executive function (EF) plays a critical role in parenting behavior. However, the majority of the research on this topic has been conducted in low-risk samples. The purpose of the present study was to investigate whether individual differences in maternal EF are associated with parenting behavior in the high-risk, high adversity context of family homelessness. The study included 94 mothers and their children, ages 4 to 6 years, living in emergency homeless shelters. Mothers completed a battery of “hot” and “cool” EF tasks as well as a self-report questionnaire of perceived stress. Parenting measures were based on observed parent–child interactions that were later coded for harsh and positive parenting practices. Results indicated that hot EF in mothers was related to positive parenting. The relation between maternal planning ability, assessed by a cool EF task, and harsh parenting was also significant, but only for mothers reporting higher levels of stress. These findings add to a growing body of research suggesting that the influence of EF and other forms of cognitive control on parenting need to be interpreted within the context of environmental stress and adversity.