it could be but if your look closely you can see little black checkers that look like they could come from breeding with a coast garter, so i think its an integrade
see this one looks a lot like the one u posted but its an integrade with a coast garter
Thamnophis atratus intergrades

Quote Originally Posted by Thamnophis View Post
I think it is a Thamnophis atratus zaxanthus.----------------------------------------------------------------------------------This one is from Contra Costa county...