Nice looking snow corn! And no, I don't believe they are wild to the Northwest, where I also live... never seen a wild corn snake, let alone ANY snake around here, LOL.

Btw, I think it's an older juvie or young adult, unless my perspective is way off. My 7 month-old looks much smaller than that, and he's eating large mouse fuzzies... so your rescue might be able to take hoppers by now. Here's a comparison shot for reference, of my young corn on my hand - he weighed around 50g last time I checked:



And in his 15qt tub