Well I went out and had a look this afternoon. Reduced the opening to about 1/2" and made sure any other openings were closed up tight. There are still quite a few wasps around the hive, but they don't seem to be getting inside much that I can see. And yes, it's getting pretty cold here. We had our first really hard frost last night. Seems to be slowing down the yellowjackets but not completely stopping them. Do they overwinter or will they be gone by spring?