This study examines the overall quality of parenting behaviours among low-income mothers in the USA and the extent to which they are influenced by risk factors within the family environment, maternal well-being and maternal risk characteristics associated with socio-economic status. Participants consisted of 1070 low-income mothers of three-year-old children who were enrolled in the Early Head Start (EHS) Research and Evaluation Project. Data were collected using structured interviews with the mothers and from videotaped mother-child interactions during play activities when children were age three. Findings indicated that less-positive parenting behaviours and fewer supports for language and learning were predicted by higher family conflict, higher parental distress and maternal social risk factors including younger age, less education and a history of public assistance. Fewer household resources also predicted fewer supports for language and learning, but not positive parenting. Negative parenting behaviours were not predicted by maternal well-being, although higher family conflict and maternal demographic risk factors (younger age, history of public assistance, not being married or living with partner) were statistically significant predictors. Findings from this study suggest that programmes to address the parenting abilities of low-income mothers are warranted, and that national programmes geared at helping mothers should be augmented by efforts to decrease the degree of stress they experience in their parenting role, as well as by effective strategies to increase available household resources and reduce family conflict. They also indicate that particular attention should be paid to enhance the parenting abilities of mothers who are younger, have lower levels of education, have a history of receiving public assistance and those who are not married or living with their partner. (Contains 3 tables.)