Cover it with some clear plastic. Use pvc pipe from the hardware store. Easy to configure / set-up / tear down. Do be sure to properly stake it into the ground. Google mini hoop house or wind tunnel, you'll get the idea.
Next year, if you put your pots on pallets and you have a pallet jack, doesn't matter how heavy or big they get, you can always easily move them. It also creates airflow around the root base which is helpful.