Few studies have examined whether training can improve competency in intervening with suicidal youths. In this study we attempted to verify the effectiveness of such a training program on helper competency. Forty-three helpers who received the training were compared with 28 helpers who did not. Participants who received the training improved in knowledge, attitudes, and intervention skills following the training, compared with the control group across measures. Their gains were maintained at 6-month follow-up. In this sample, implementation of a one-time training program improved helpers' competencies in youth suicide intervention.