A growing number of sport-for-development (SFD) organizations have emerged in the nonprofit sector to leverage sport for social change, yet many organizations struggle with chronic resource deficiencies that inhibit their long-term viability and highlight a pressing need to examine the sustainability of SFD organizations through resource-based perspectives. This study analyzed secondary financial and administrative data from SFD organizations in the United States to examine changes in key resources during early organizational life stages. Latent profile analysis was utilized to classify organizations based on their level of resources, and multilevel growth modeling revealed significant changes in key resources over the first 5 years of operation, as well as significant differences based on initial resource levels and rates of change. The results provide theoretical insight into the key resources associated with organizational sustainability in the SFD field and offer practical implications for resource procurement, prioritization, and management.