There are several hardy Butterworts (Pinguicula), Sundews (Drosera), Bladderworts (Utricularia). And Pitchers Plants (Sarracenia). That grow naturally in North America.
I am planning on spending a lot of my summer looking for new native specimens. I have already located a Bladderwort growing wild in a bog area near my home in Northwestern Montana.
I would like to recommend the book "Carnivorous Plants of the United States and Canada," by Donald E. Schnell. I bought my copy from Amazon.com. You can purchase unexpensive used books there.
Sean is right about the Nepenthus, they are not even native to North America. But there are many carnivorous plants that are hardy clear up to Alaska.
Most carnivorus plants require peat and a non alkaline sand, Just to be safe I use perlite instead of sand. Some sarracenias in the north do grow in clay though.
I have seen those large cement mixing trays at Lowes. I'm sure I will wind up with one sooner or later too.
Happy growing,
Patsy