to just release it. trying to keep a WC snake in the fall is pretty iffy. If it does not acclimate and will not feed, it will die. The small terrestrial snakes are not a very hardy species, and will even die in the summer if not setup correctly and not released in time if they fail to feed.
Your best bet would be to wait until next spring and find an adult. They are fairly easy to find in the wild, and once you get one set up and it will not feed, you can release it. The problem with catching a snake in the fall is that you cannot release it after it gets too cold, and therefore it is doomed to die if it will not feed.
If you are interested in trying your luck with these small ground snakes, just about any of them will demand the same requirements:
1 substrate should be natural potting soil. Do not use Miracle- grow or any other that has chemicals in them.
2 Fairly humid, need to maintain the enclosure fairly humid and cool. They do not like really warm temps. The warm end should be no warmer than 77 or 78 and the cool end should be around 73 - 74.
3 food - they will all readily feed on small earthworms, slugs, and other soft bodied grubs/worms.
Good luck on your decision either way
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1.0 Corn snake "Warpath" (KY locale)
1.0 Black rat snake "Havok" (KY locale)
1.1 Black rat snakes "Punisher and Mystique" (MO locale)
1.0 Eastern Yellow Belly racer "Nightcrawler" (MO locale)
1.0 Albino Black rat snake "Malakai" (Dwight Good stock)
1.0 Everglades rat snake "Deadpool" (Dwight Good stock)
0.1 Greenish rat snake "Rogue" (Dwight Good stock)
1.1 California king snake "Bandit and Moonstar" (Coastal phase)
1.0 Prairie king snake "Bishop" (KY locale)
0.1 Black king snake "Domino" (KY locale)
0.0.1 Eastern Milk snake "Cable" (KY locale)
0.0.1 Eastern/Red milk intergrade "Omega Red" (KY locale)
Good luck and Happy Herping
Brian