This study examines how research on climate migration has developed from a dispersed topic of academic interest into a distinct academic field. Although the links between environment and human mobility have been studied for over a century, less attention has been paid to how knowledge has been structured and institutionalized around this topic. To address this gap, the article examines how climate migration scholarship has grown, organized its scholarly community, and gained recognition from external actors. Drawing on theories of field formation, we analyse four dimensions of academic fields: differentiation from other research areas, epistemic and social coherence among scholars, their social infrastructure and legitimacy-building. The study uses a mixed-methods approach combining bibliometric analysis, document and policy review, and expert interviews. The findings show that the formation of climate migration as a research field was a cumulative process. Policy attention brought resources for more research, while a shared understanding that climate migration is driven by multiple interacting factors, not climate alone, gave scholars common ground to organize around. Expanding citations and co-authorships networks then gave the field its structure over time. However, the field formation remains uneven. The networks are geographically uneven, research is being published across hundreds of journals, and theoretical frameworks are underdeveloped. Overall, the article shows how new research topics consolidate as academic fields and argues that the label of ‘research field’ is not merely descriptive because it impacts visibility, resources, and epistemic authority.