BackgroundAdults with intellectual and developmental disabilities (IDD) experienced significant disruptions in their access to health care, support services, and essential daily activities such as work, leisure, and routine daily care during COVID-19. ObjectiveThe purpose of this study was to describe overall experiences related to COVID-19 among adults with IDD, including the vaccination process, quality of life (QoL), and service satisfaction before and during the pandemic. MethodsA longitudinal statewide survey of adults with IDD receiving long-term care support using a combination of self- and care partner report was completed prior to (2017; n = 331) and during (2021; n = 206) the pandemic. ResultsQualitative results identified specific vaccine barriers, vaccine decision influencers, and general experiences during COVID-19 for adults with IDD. The importance of support staff, vaccine availability, disruption in daily activities, social context, and mental health implications were noted in responses to all three topics. Quantitative results showed lower QoL during COVID-19 (M = 2.99 vs. 3.14, p = .028); however, when reporter (self vs. care partner) and age were added to the model, differences between pre-vs. during-COVID were no longer significant. No significant differences in satisfaction of services were noted pre-vs. during-COVID-19. Ninety-six percent of respondents reported access to the vaccine, and 16 % experienced barriers getting the vaccine. QoL was associated with receiving the COVID-19 vaccine (r = 0.15, p = .036), level of agreement that the vaccine is safe (r = 0.17, p = .024), and level of agreement that getting the vaccine will help protect other vulnerable people in the community (r = .25, p = .001). Level of satisfaction with quality of services was also associated with level of agreement that the vaccine is safe (r = 0.15, p = .048). ConclusionsOverall, a better understanding of service continuation, support practices, and experiences related to COVID-19 will prepare us for future environmental and health crises by identifying areas for improvement, intervention, and policy change to meet the ongoing needs of adults with IDD.