It would seem too cold out to release it, yet they somehow manage to survive the winter. I'd say it's a 50-50 for survival unless you release it where there is deeper ground cover like a forest floor with leaf buildup. Most salamanders apparently burrow during the winter, but not all.
I'll take another look around and see if I can find anything like it that should be here in Indiana. I had a blue spotted salamander dropped off at my house a couple weeks ago. I've been debating releasing it too.
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**Kenn**