Northern Illinois: Venomous Snake and Scorpion Free since before the the last ice age !!!
Not exactly
You still got timber rattlers, few and far between but you do.
Also copperheads can get there via barges from the south, winter does kill them. Also cottonmouths can be found near water sources.
Brown recluse and black widows can be found there to.
I grew up in SE IA and fished a lot of the Mississippi river as a kid and I remember seeing lots of cottonmouths, used to piss them off with my fishing pole. Only time I saw rattlesnakes was in the early morning when they were coiled up on the side of the asphalt in the river bottoms. Dad told me about seeing copperheads in the summertime on the rocks near the railroad bridge he worked on, but I never got to see any.