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When the foragers start bringing branches in, it's time to remove the wraps 
. That must be an entrance reducer? I don't know, the timing of wraps I don't think is even close to critical. The bees don't heat the interior of the colony, just the cluster, so the wraps IMO only take the edge off the bitter coldest nights (which you certainly get up there). However they also are unlikely to harm anything until either nectar foraging/brood rearing needs ventilation or daytime temps in the sun mean the heat from the sun on the wraps make more bees ventilate than necessary (overheating).
I'd take them off when overnight lows are no longer below, I don't know, 30F?
. That must be an entrance reducer? I don't know, the timing of wraps I don't think is even close to critical. The bees don't heat the interior of the colony, just the cluster, so the wraps IMO only take the edge off the bitter coldest nights (which you certainly get up there). However they also are unlikely to harm anything until either nectar foraging/brood rearing needs ventilation or daytime temps in the sun mean the heat from the sun on the wraps make more bees ventilate than necessary (overheating). I'd take them off when overnight lows are no longer below, I don't know, 30F?
