Using data from the third School Nutrition Dietary Assessment Study, this study estimates the effects of school food environments on children’s consumption of sugar-sweetened beverages, low-nutrient energy-dense foods and fruits and vegetables in school. The national study involved more than 2,300 children in 287 schools. Results demonstrated that sugar-sweetened beverages consumed at school contributed an average of 29 kcal per middle school student and 46 kcal per high school student. Sugar-sweetened beverage consumption was lower in children attending schools: without stores and snack bars (in middle and high schools); not offering a la carte offerings (in middle schools); not having a pouring rights contract (in middle schools); and not offering french fries (in high schools).