Hi!
Yep. Do that. It's a method that's been used for a long time... Thousands of years? but won't get you from zone 5 to 7. It will keep your various stored in the ground at zone 5-6, and maybe get some of your zone 6 stuff to make it through a zone 5 winter. And, the more of these protections you use, the more likely it will make it through. I did hear of a citrus tree making it in a cold climate with
enough protection, but I haven't tried that yet. Good luck!