What lure types do you guys recommend when the water temp. gets pretty cold? The water temp's pretty cold now here in Wisconsin. At what water temp do the bass just shut down? Thanks.

when the water gets cold and the bass slow down i normally use 1/8oz-1/4oz jig and pig or plastics... fish them very slow.

The bass don't hibernate. Their metabolizm just slows down as the water gets colder and they don't use as many calories to move about so they don't need to eat as much or as often as when the water is warmer. When the water surface is frozen or close to it, they are usually on or near the bottom where the water is the warmest of the water column. Bottom bouncing lures will take them. My most productive lure for that type of fishing is a Silver Buddy.

A light jig in pig, bounce it slow.

Good luck!

Jig n pork in 3/8 or 1/2oz is the trusty bait that probably catches the most fish in cold water. I will be out tomorrow throwing a jig here in Minnesota. The water temp's are around 49 degrees right now.

Think Vertical

Think Deep

Think Bottom

Think Slow

A bass's metabolism is finally tuned to its circulatory system temperature which is the same as the surrounding water temperature. In cold water their metabolism slows down, their brain slows down, so the bass slows down. In cold water a bass's instincts are less finely tuned, it has less appetite and it mostly stays suspended near the bottom.  

It is fairly easy to catch bass in cold water, if you can find them and if you use the right techniques. This means putting bait in front of a fish that looks right, sounds right, and smells right. The colder the water, the slower the bass's brain operates so the slower you must present the bait or the it's gone before the bass's brain tells it to bite.

I totally agree with what's been said previously. Also, add a blade bait into your arsenal! You won't regret it.