Sean, we are indeed in the PNW, you are reasonably close to where I live (reasonably). Do not wrap your hives. It is not needed, not even in your wildest dreams. Bees can live in -35 degree weather, easily, they simply cluster more tightly. That is pretty cold.
The problem also with keeping the bees too warm is that they might think it really warm outside. Venture outside only to find out that their life will be over because they get so chilled they can't fly. The cannot fly if their body temperature becomes too low. Don't wrap. Provide upper ventilation for sure, like the slot in the inner cover at the front. An entrance reducer with the small opening used is what you should alslo be using. They need some opening at the bottom to allow air in, and one in the top cover to release the moisture the hive creates. Important. This is what we do in our Pacific Northwest. Best of this beautiful day, and have a great day too. Cindi