Mark, may I make some comments from Seattle?
I don't use winter wrap but I do tape the joints between boxes to guard against wind chilling.
I think the hazard is moisture not cold so I leave the entrance completely open (though with mouse guards). My queens always reduce their egg laying in the late fall and have again this year. I always worry about late fall increase in varroa - I never measure the drop - so I apply apistan very late, 42 days before my last inspection in the first week of November. Dan
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