Focusing on vulnerable children and youth in Canada, including their parents and caregivers, the broad Safe Play Spaces project aimed to: (1) Describe what we know about current outdoor play spaces for vulnerable populations in Canada; (2) Develop an online training tool for inspecting outdoor play spaces for safety issues; and (3) Share outdoor play space safety issues and information with stakeholders, municipalities, parents and caregivers. This particular report presents the methodology and results of a play spaces key informant survey, the purpose of which was to determine what is known about safety issues associated with play spaces for vulnerable children aged 6-12 years in Canada.