Schoolyards represent an important opportunity for physical activity, development and learning. However, there is minimal policy or accountability for their level or distribution. Through community partnership and citizen science, we built a system-wide picture of schoolyard quality across Ontario, using a validated, standardized tool. Quality was low with considerable variation. The top-scoring school scored 61 of a possible 88 points, the minimum was 14 (M = 35.3; SD = 9.9). Affluent schools and communities had slightly better playgrounds than poorer ones. Knowledge mobilization about how schoolyards impact health and shortcomings in existing resources raise possibilities for advocacy and policy work.