outdoor water pipes
If all else fails you have to get air into where the shutoff is, so it drains and sloped down to spigot. Either you need another valve that admits air or need a bleeder on it to allow air. If water is air trapped in there it will still freeze. In conjuntion with a frost proof sillcock. If your unfamiliar with what that is go to the big box stores and ask for them,,,they make all the difference in the world. You MAY just not understand the terms used here,,,quite understandably.