How thick are the snakes in the red? I'm not worried myself...but the last time my climbing partner saw a snake on a route.....he damn near killed us both!!!

We don't have poisonious snakes in New Brunswick...but I hear you guys do.
What are the names of them, and where/when should we be aware of it on our trip.
So...that covers my partners phobia....mine happens to be spiders.....please tell me you have NO poisonious ones!!! ha ha ha
thanks!
cara