Doubtful in northern Kentucky, as the natural range of the Checkered Garter goes no farther east than western Oklahoma and central Texas. You're probably seeing spotted-phase Eastern Garters.
To attract snakes, you sorta have to think like a snake. They need food, water, and shelter - not much else (except during mating season!
) And they won't stick around if there are predators in the area (natural or otherwise). Garters eat mainly frogs, tadpoles, earthworms, and small fish. So setting up a small pond, and stocking it with frogs and small fish, might help. Put plenty of flat rocks or boards around it, to provide shelter/hiding spots. Dogs, cats, birds, raccoons, etc. all can be considered predators, so they'll have to be kept away.
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MichaelB