Several professional organizations, non-profit groups, and researchers have provided K-12 blended teaching (BT) competencies; however, few of these have connected competencies to concrete practices. This analysis used a set of research-based BT dispositions, technology skills, and competencies (i.e., proficiencies) to analyze a representative sample of 959 artifacts focused on BT practices to uncover the proficiencies important to K-12 BT. The dispositions recognized for BT appeared in 87.9% of the artifacts, personalization competencies in 58.3%, technology skills in 54.0%, data practices in 46.0%, implementation competencies in 37.1%, online integration competencies in 30.4%, and online interaction competencies in 5.6%. Each of these areas was analyzed in more detail, looking at specific examples and frequencies within each category. These findings provide a foundation for future research seeking to understand the competencies and practices important to K-12 BT.