Well, my friend and I have had MAJOR luck with powerbait in the winter.
The Rainbow Trout here in the N Georgia mountains love the power honey worms. I have caught my limit on the red ones...in the cold.
I actually caught one of my biggest trout last Feb. And; it was on powerbait honey worms. The brown earthworms are good as well.

However, the live cricket is THE BEST trout bait EVER!!!!