Parents of youth with disabilities require knowledge to support their children in secondary school. In the 21st century, online asynchronous training is one way to provide knowledge to parents in learning secondary transition concepts. We explored the use of an asynchronous online intervention on three parents' knowledge of the secondary transition process and confidence levels in supporting their children with disabilities. We used a single-case, concurrent multiple baseline design across three transition areas to evaluate parents' knowledge of secondary transition planning. Preliminary evidence showed the asynchronous online training improved parents' knowledge of secondary transition for two participants who completed the entire training program across all three transition areas. Limitations and recommendations for future research and practice are discussed.