King snakes generally grow to a medium size, with most species reaching lengths between 3 to 5 feet. Some species, such as the Eastern kingsnake, can grow up to 7 feet long. The common adult length range is around 3 to 6 feet, depending on the subspecies. For example:
- Small king snakes like the Arizona Mountain kingsnake grow up to about 3 feet.
- Larger species like the California kingsnake and Eastern kingsnake can reach 5 to 7 feet.
- The average weight ranges between 1 to 4 pounds.
Factors influencing their size include environment, diet, and genetics. In cooler climates, they may grow larger due to slower metabolism. Adult king snakes can weigh up to around 4.8 pounds with some variation depending on the species.