Improving the health care transition process for youth with autism spectrum disorder (ASD) is critically important. This study was designed to examine the overall national transition core outcome among youth with ASD and each of the component measures of health care transition planning. Fewer than 10% of youth with ASD meet the national transition core outcome. Among youth with ASD, there is greater disparity in health care transition planning for non-Hispanic black youth, youth with family income < 400% of the federal poverty line, and youth with more severe activity limitation. Continued advocacy, research, and training efforts are needed to reduce disparities in receipt of health care transition planning services for youth with ASD.