Diadophis punctatus, commonly known as the Ring-necked Snake, is native to North America. Its geographical distribution includes much of the eastern and central United States, extending into parts of southeastern Canada and northern Mexico. It is found from the southern Great Lakes through the eastern states, as well as parts of the Midwest and southward to the Gulf of Mexico.

Ring-necked Snakes inhabit diverse environments, typically preferring regions with moist conditions. They are commonly found in woodlands, grasslands, rocky hillsides, and near bodies of water like streams and ponds. These snakes favor areas with abundant ground cover such as logs, rocks, and leaf litter, which provide protection and sites for thermoregulation.

Diadophis punctatus is primarily terrestrial and nocturnal, playing a role as both predator and prey within its ecosystem. It typically preys on small amphibians, earthworms, and small reptiles. The species is known for its secretive nature and ability to remain hidden due to its slender body and cryptic coloring.