This article explores the potential for health promotion capacity building across boundaries in a place-based health promotion learning network generated as part of a recent Australian Research Council-funded project in Queensland, Australia. We emphasise in particular the potential of creating new ‘at the boundary’ spaces of knowing that encourage and enable health promotion workers to work in interdisciplinary and intersectoral ways. The article discusses the way that diverse health promotion workers from different disciplines and government and non-government organisations came together to learn ‘how to do’ in new or re-invigorated ways. For many network participants, this cross-boundary space of knowing and capacity building provided a welcome respite from their daily contexts of practice which may be limited by institutional, disciplinary or other boundaries.