As fall has moved into winter, temperatures will continue to go well below freezing.  Although most winter vegetables can tolerate temperatures slightly below freezing, tunnels offer a way to extend those cool weather vegetables when the temps dive low.  We have had our 1st significant freeze and temperatures that plunged into the low twenties. In anticipation of the colder temperatures, I got some row tunnels to protect my winter garden during the really cold days. Here is what I bought on Amazon to make my garden row tunnels: The polytunnel is also known as a hoop tunnel, hoop greenhouse, row covers, or hoop house. They are typically made of steel…