Ha, I had a question. What makes a better anti freeze propylene glycerol, flake anti freeze, or powder anti freeze. What does everyone have the best luck with? And how cold does it have to get before switching over to wax dirt?

You will have five different opinions, even though you listed three different anti freezes. As long as you understand the aftereffect of those substances, you should try them and make up your own mind! lol

I never switch I start with wax. Here in wonderful IL it rains before it freezes.

Yep, I start with waxed dirt too. Out here, you never know what tomorrow will bring.

May is pretty good as far as not freezing goes

Your flake or powder antifreeze will provide better protection under 20 degrees than glycol. The flake and powder is caustic to metal so it will cause some rusting on traps. This is my experience from the way I have used these products but as Lee stated you may have to use each 1 to figure out what works best with your style of trapping and conditions.

Waxed dirt as soon as the ground starts freezing. I have tried the others, but they all suck, by comparison