Purpose This study aims to understand consumers' reactions to hospitality corporate social responsibility (CSR) campaigns under different resource scarcity reminders, an important but overlooked contextual factor, and examine how such scarcity reminders interact with message framing, a widely used technique in CSR communication. Design/methodology/approach Three experimental studies were conducted. Studies 1 and 2 examined the main effect of resource scarcity reminders (environmental vs personal) on consumer engagement via self-other orientation. Study 3 further investigated the interactive effect between resource scarcity reminders (environmental vs personal) and message framing (gain vs loss) with hope as a key mediator. Findings Studies 1 and 2 show that environmental (vs personal) scarcity activates a more salient other orientation, subsequently increasing consumers' donation and word-of-mouth intentions. Study 3 reveals that environmental (vs personal) scarcity makes people more hopeful with gain-framed messages. Moreover, the elevated hope enhances perceived efficacy (attitude toward the company), leading to higher donation (word-of-mouth) intention. Practical implications Hospitality marketers could remind consumers of the harsh environment to elicit other orientation and encourage CSR participation. Using gain-framed messages or other hope-inducing appeals would be particularly advantageous in engaging consumers in CSR campaigns during heightened environmental scarcity. Originality/value Focusing on consumer responses to CSR campaigns, to the best of the authors’ knowledge, this research is the first to reveal reminders of resource scarcity as a novel antecedent factor and further uncover how such reminders interact with message framing to affect CSR engagement.