This article examines customary institutions governing rangeland resources in the Oromia Region, Ethiopia. Using data from different pastoral groups, we employed a case-study approach to explore how property rights are defined and enforced. The study indicates heterogeneity in systems of defining and enforcing rights. Due to the fugitive nature of resource use in pastoral systems, property rights vary seasonally. Though flexibility in the definition of such rights has become central to the survival of pastoral herders, formal administrative boundaries and policies have limited resource access, becoming sources of violent conflict and obstacle to customary systems. Government policies favouring private land use, expansion of large-scale investment on pastoral land, establishment of national parks, and certification of privately used land challenged the smooth functioning of customary land governance. This implies that state intervention should not undermine customary systems but permit them to exercise rangeland governance and ensure pastoral rights to secure livelihoods.