Understanding the experiences of autistic high school students, including participation in social and vocational activities, has important implications for high school programming and links to postsecondary outcomes. The primary aims of this study are to describe these experiences and examine relationships with two aspects of educational programming: diploma status (standard and modified) and autism program quality. Researchers collected data from 547 autistic high schoolers across three U.S. states at pretest as part of a large-scale intervention study. Results demonstrate a wide range in frequency of participation in social and vocational experiences. Diploma status was related to several types of participation while, in contrast, overall program quality was linked to only one outcome. Implications for high school planning and educational placement decisions are discussed.