In this paper we propose the concept of 'becoming-with' in relation to the experience of the catastrophic fires in the summer of 2019-2020 in Australia, and their implications for research into young children's response to bushfires, and their learning about bushfire recovery, which resulted in the development of an arts-based project to explore emergent curriculum and pedagogies for planetary wellbeing. We draw on Deleuze and Guattari's theorising that 'the self is only a threshold, a door, a becoming between two multiplicities'; and 'Spatio-temporal relations' as 'not predicates of the thing but dimensions of multiplicities of events as encounters' to theorise how 'becoming-with' fires enabled the development of emergent curriculum and pedagogies in an early learning centre, which can ultimately contribute to planetary wellbeing.