Background Children with autism have been shown to engage in lower levels of physical activity than their neurotypical peers. Safety-related concerns among caregivers of children with autism can present a barrier to children’s participation in recreational and sport activities.

Objective The objective of this study is to use end-users’ preferences, research evidence and behavior change theory to design and develop content for a website to promote safe sport and recreation participation for children with autism.

Methods An online survey was used to determine priority topic areas and website format preferences among caregivers and service providers who care for and work with autistic children. Content was developed for each website topic. For sport topics, information included the benefits of each activity, the potential safety risks that could be involved, and suggested strategies to enhance safe practices. Content for each topic was informed by current research evidence and guided by behavior change theory. Expert review was sought for each website section.

Results The website was designed in collaboration with a web-developer experienced with children’s health projects. The website layout and organization reflect the priority topic areas identified through the online survey and consists of six sport areas and five behavioral topics. Content has been reviewed by experts for each topic as it relates to the needs of autistic children and their families. Next steps will involve end-user testing and evaluation using mixed methods.

Conclusions This online resource offers information for caregivers of autistic children to promote their participation in community sport and recreational activities. This resource aims to enhance caregiver confidence with promoting children’s sport and recreation participation by supporting inclusion and addressing safety concerns that could otherwise limit participation. This resource ultimately aims to support safe activity participation to promote healthy child development.