HELLO, I am taking out a dishwasher and putting it in storage in the garage that has no heat and subject to freezing temps. Do I have to put antifreeze in before I do it? Thank you!

Unless you run the dishwasher with the antifreeze in it (which I do not recommend) it will be difficult to get all of the water displaced with antifreeze. I would turn it up on its side, unhook the hoses and the pump hose and get as much water out as possible. Leave the hoses that way until you get ready to use it again.