In many post-war countries, the relative security brought to rural areas is construed by government officials and business actors as an opportunity for development. This is particularly true for marginal areas, where opportunities for economic development had previously been hindered by the threat of violence. This provides a favourable context for the construction of commodity frontiers. Through the case of Colombia, I show that one of the main challenges faced by frontier policy narratives amounts to differentiating wartime dispossession from peacetime legitimate accumulation. This poses intractable challenges to policymakers and business actors, as it fuels the contradictions between peace consolidation and post-war development.