Building disaster resilience for homeless individuals and those with substance use disorders in British Columbia requires a holistic approach that leverages place-based knowledge, social learning, and collective action. By engaging vulnerable populations through citizen science research, this approach will co-create practical, community-driven solutions for mitigating the impacts of disasters. The resulting CDRA toolbox will serve as a critical resource for building more inclusive, equitable, and resilient communities in the face of increasing disaster risks.