Abstract
This study views interorganizational trust as a dynamic process and examines it in two cross‐sector collaborations in community development. Based on in‐depth case study, we conceptualize the evolution of interorganizational trust into four distinct stages: initial propensity, boundary spanning, diffusion and normalization. The findings show that sustainable cross‐sector collaboration requires the full evolution of interorganizational trust. The findings also highlight the importance of internal motivation and the participation of third parties. In addition, while formal rules contribute to rational trust, informal rules arising from interactive experiences can complement formal rules and promote emotional trust.