The article seeks to theorise an integrated decolonised feminist frame for peacebuilding in an African context. Arguing that a decolonial-feminist lens has the potential to change the way we look at peacebuilding practices, I propose the notion of ‘feminist frontiers’ – an engaged yet stabilising heuristic tool for analysing racialised and gendered relations post-conflict. The argument is structured around three pillars, namely: metageographies as metaphoric mental-space constructions of a colonial peace; masks that constrain the introduction of complicated and intersected human subjecthoods; and mundane matter that elicits ambivalent engagements between human and post-human subjectivities in the areas of everyday political economies and infrastructural rule of peacebuilding. I conclude that such feminist frontiers represent intermediate and mediated spaces or epistemological borderlands from where the undertheorised and empirically understudied discursive and material dimensions of peacebuilding from a gender perspective can be investigated.