Objectives: To determine effects of the "5-4-3-2-1 Go" community social marketing campaign on obesity risk factors. Methods: We randomly assigned 524 parents of 3- to 7-year-old children to receive "5-4-3-2-1 Go" counseling or not. We surveyed parents about "5-4-3-2-1 Go!" behaviors and perceptions of children's behaviors at baseline and one year later. We conducted multivariable logistic regression for each outcome. Results: Parents who received counseling consumed more fruits and vegetables at follow-up (OR 1.749, [95 CI: 1.01-3.059]). Parental exposure to messaging at children's school events was associated with higher water consumption (6.879, [1.954-24.212]). Conclusions: "5-4-3-2-1 Go" is a promising intervention.