I moved this from "weather" to " brugs" since we sort of hijacked the weather thread. I just didn't have time to do it earlier.
I'd be very leary of leaving brugs out if the weather gets cold and wet. I've lost brugs that I thought would be fine based on previous winters.
I've tried lots of ways to over winter them. One year, I covered some of the trunks with bubble wrap, further covered with pipe insulation. The moisture got in anyway and though the trunks remained standing, they were never the same. I eventually lost those. They never really thrived. It only takes a couple of freezing nights do really do them in.