I agree that it really does look like a desert king. I don't think they're native to your area though.
On a list of KY snakes I noticed that there's black kingsnakes and speckled king snakes. When they're hatchlings they look an awful lot like that. They change as they get older then.
Here's a picture of some black king snake hatchlings.
http://www.snakeeducation.com/snakes...2015,%2006.JPG and here's a speckled king hatchling.
http://www.reptilesweb.com/images/st...-kingsnake.jpg
You have speckled kings in your area and that's kinda what it looks like to me. At least it's the closest I think....
I'm no expert at all though, so don't hold me to it! ;p
P.S. Just my opinion on the matter, but I personally would let it go. If it lives in the wild there then I would think it would keep on living even without our intervention from native weather.
Maybe wait until tomorrow afternoon when it gets warmer so that it can go off and find shelter. Drop it off in a nice rocky, wooded area perhaps.
I think it will be fine though.
Just my two cents. ^^
Very cute lil' guy by the way! Nice find! <3