Scientific Name Common Name Global Rank State Rank Federal Status WI Status Animal Group

Plains Gartersnake (Thamnophis radix)








Photo by A.B. Sheldon


Counties with Mapped NHI Occurrences

Plains Gartersnake (Thamnophis radix), a Special Concern species in Wisconsin, prefers almost any open-canopy wetland type (not open water) and adjacent open to semi-open canopy upland, including prairies, old fields, and weedy vacant lots. It also prefers low-canopy vegetation (<24"), although will occupy habitats with taller vegetation such as reed canary grass. This species can be active from mid-March through early-November, usually emerging shortly after frost-out and remaining active until daytime temperatures fall consistently below 50 deg. F. Breeding usually occurs in April or early-May but can also occur in fall, live young are born mid-July to mid-August.


Species of Greatest Conservation Need (SGCN) are associated with habitats (or natural communities) and places on the landscape. Understanding relationships among SGCN, natural communities and ecological landscapes help us make decisions about issues affecting SGCN and their habitat and how to respond. Download the Wildlife Action Plan association score spreadsheet to explore rare species, natural communities and ecological landscape associations

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the Wisconsin Wildlife Action Plan because lack of information can threaten our ability to successfully preserve and care for natural resources.