Several years ago when I still lived in Ada, my son and I planned a fishing trip here to Eufaula. We bought our minnows there in Ada so in order to keep them fresh, I laid the minnows (in a bag with O2) on top of a layer of ice in the big ice chest, and then covered the top of the bag with minnows with more ice. I told my son they would be fine since we were able to keep them cool all the way over.

When we got to the boat ramp at 9A, the minnows were all teats up......... they looked like they had frozen to death. It was 2AM and no place open to buy minnows (that's why we brought em from Ada in the 1st place).

So, the moral of the story if there is one, don't get em too cold or it'll kill em too.

George gave you some good advice, try his method and go by what reapers says too. Bottom line: Minnows are just really hard to keep alive in the heat of summer.