To explore the accessibility of school-wide positive behavioral interventions and supports (SWPBIS) for students with severe disabilities, we conducted a survey of 179 schools implementing SWPBIS during the 2015-2016 school year. Personnel from each school reported the frequency and level of importance of SWPBIS implementation across Likert-type scale items related to the domains of systems procedures, practices, and data collection procedures applicable to students with severe disabilities. Personnel from each school also responded to open-ended items to report barriers to and strategies for including students with severe disabilities in SWPBIS. Overall, school personnel reported high levels of implementation and importance across these SWPBIS domains and a range of barriers and strategies related to SWPBIS accessibility. School characteristics related to grade level, tiers of SWPBIS implementation, and the percentage of students included in general education settings for a majority of the school day contributed to statistically significant differences in ratings of frequency and importance for some aspects of the SWPBIS domains.