The objective in this paper is to identify driving forces and favourable factors that ensure the persistence of mountain livestock farms over time. The paths and processes of change are studied in a sample of 14 existing livestock farms near Chambéry in the Savoie, adopting a retrospective approach going back to the 1950s. The authors focus on key factors: workload, dairy restructuring and off-farm job opportunities. The results show that in this area, livestock farms have persisted thanks to the integration of other farming or off-farm activities in the farm-family system during at least one phase of their history.