Nah, they're not poisonous, I just did a quick search. Its a type of garter snake which is in other words a common garden snake. Non-poisonous.
ha i find these at my cabin all the time i actually have a scar from one that bit me but no they're not poisonous at all
ya i thought it was a garter snake at first but then it shot me with a really bad smell then i learned it was a ribbon well thanks