This chapter explores the notable absence of a clear history of planning for and with children and young people, focusing on the UK experience and touching upon trends elsewhere. Through uncovering the multifarious ways planning has reacted to the needs of children and young people, it notes how modern planning moved from planning with families in mind in the early twentieth century, to planning children and young people out of public space in the latter half. For example, while garden cities and early New Towns put walkability and community facilities at the centre of their ideals, later trends in planning saw motor vehicles and economic efficiency prioritised. The ways children and young people have been problematised in spatial organisation gives us insights into the underlying philosophy of planning practice and its perceived role in society. Particular attention is given to the role planning has played in the normalisation of the playground as the main (or only) contribution to children’s spatial needs. The chapter ends by touching upon more recent changes in planning practice, as children’s human rights and well-being come increasingly to the fore.