This study provided a randomized experimental test of the implementation feasibility and the efficacy of a culturally adapted parent training intervention for a sample of 73 Latino families with middle-school aged youth at risk for youth problem behaviors. Intervention feasibility was evaluated through weekly parent satisfaction ratings, intervention participation and attendance, and overall program satisfaction. Intervention effects were evaluated by examining changes in parenting and youth adjustment for the intervention and control groups between baseline and intervention termination approximately 5 months later. Findings provided strong evidence for the feasibility of delivering the intervention in a larger community context. The intervention produced benefits to both parenting outcomes (i.e., general parenting, skill encouragement, overall effective parenting) and youth outcomes (i.e., aggression, externalizing, likelihood of smoking, and marijuana and other drug use). Differential effects of the intervention were found based on youth nativity status.