Young people are imagining a better world in conversations locally and globally, in the streets, in the classrooms and in their everyday life. Young climate activists are people who work for transformative change, radical kindness towards others and climate justice in a deeply unjust world. Some activists call themselves activists, and some do not, but we use the term activist to bring attention to the diverse range of things young people do for climate justice. At the same time, young people must navigate a complex intersection of profound crises and sudden ruptures, from war to pandemics, from the continuing legacies of colonialism to racist police violence in their city streets. This chapter, which is written in collaboration between a researcher and a food grower, reflects on the activism of young people during the climate crisis. We use the concept of “precarious hope” (Nunn et al. 2021) to argue that traditional and adult-centred approaches to young people’s participation tend to be optimistic and progressive. Young hopes are often found pushing through the cracks, and rupturing the structures and systems of the dystopian future they live in. We hope that a concept of precarious hope will uphold young people in future activism, and support researchers in the study of young people who are taking action for a liveable planet.