You can grow *almost* anything in any region. However, you will always have an easier time growing food in a warm climate. But you have to have adequate water sources. Hot weather is useless if it's too dry.
Florida has a warm climate; we can grow citrus that you cannot produce in colder climates. But there are many things that we cannot grow in commercial quantities because of the heat.
Only a few varieties of apple, peach and pear will take the heat here; a warmer than normal winter means no crop and when you can get a crop the product cannot withstand shipping. You can grow oats in some parts of the state, but only as a winter crop again meaning no crop in a warm winter. Crops that are prone to insects, mold or mildew (tomatoes, squash, pumpkin) cannot be grown here without large inputs of agro-chemicals, and our soils are so porous they won't hold organic matter so you have use manmade fertilizers on just about everything you grow. Then there are things like wheat, cherries and maple syrup that you cannot produce here at all.
If you wanted to establish a fully self-sufficient homestead, what 100 square mile area of the country would give you the most suitable growing conditions for the greatest variety of foods?