This paper documents the reliability of a new coding tool developed to evaluate the quality of school wellness policies. The 96-item coding tool assesses seven goal areas, and each of these goal areas was scored on the dimensions of comprehensiveness and strength. To evaluate reliability, researchers from four states coded a sample of 60 policies between July 2007 and July 2008. The coding system provides a reliable method for analyzing and comparing school district wellness policies in single or multistate studies.