The smooth snake is confined to lowland heathland in southern England and is one of the rarest reptiles in Europe.
Smooth snakes face severe welfare threats from heathland loss and fragmentation. Development and inappropriate management of heathland eliminates the lizard prey they depend on. Road mortality affects dispersing individuals in fragmented landscapes. Illegal collection for the pet trade still occurs. Climate change may alter heathland vegetation structure in ways that reduce suitable habitat.