A. perroteti is endemic to the Nilgiri Hills of the Western Ghats, in south India. It occurs in high-elevation hills, above , of Kerala and Tamil Nadu states. This species is known from the Upper Nilgiris, including Mukurthi National Park, Silent Valley and Vellarimala or Camel's Hump and Siruvani peak. Perhaps it has the smallest geographic range of all Indian Ahaetulla species.