Migration has emerged in recent decades as one of the defining phenomena of rural–urban relations, driven largely by transformations in spatial hierarchies. This process has reshaped demographic, economic, and spatial structures of rural communities. Reverse migration, conceptualized as a form of rural urbanization, refers to the return of individuals who have lived and worked in major urban centers or advanced countries to their places of origin, including villages, small towns, or less-developed provinces. Such return spillover migration is accompanied by the transfer of financial capital, managerial and technical expertise, social networks, and consumption patterns, thereby influencing local development trajectories. The present study seeks to identify the factors shaping rural entrepreneurial environments, assess their quantitative and qualitative impacts, and propose strategies to strengthen rural entrepreneurship. Employing a descriptive–analytical approach, data were collected from 217 questionnaires in Rostaq district (Ashkezar region). Causes of rural migration were examined across four dimensions—economic, socio-cultural, educational, and geographical—while its effects on entrepreneurial spaces were analyzed in physical, socio-cultural, economic, and environmental domains using mean tests, one-sample t-tests, and multivariate regression analysis. Findings reveal that limited employment opportunities, low income levels, and livelihood challenges are the most significant drivers of rural-to-urban migration, particularly among the young labor force. Conversely, return spillover migration is strongly influenced by economic and social factors, while geographical considerations play a minor role. The economic dimension demonstrates the greatest impact, stimulating entrepreneurial activity, followed by socio-cultural influences; physical effects are moderate, and environmental impacts minimal. Overall, the study concludes that return spillover migration directly and indirectly contributes to the creation of rural entrepreneurial spaces. Policies should therefore encourage diverse forms of migration to rural areas, foster economic and social sustainability, and provide facilities and support mechanisms to strengthen entrepreneurship and local job creation.