Is it too early to think about wrapping? The insulation vs ventilation fight, round one
Quebec, five years in, and every September the same bar fight breaks out at my club: the wrap-early crowd says get insulation on before the first cold snap stresses the colonies; the ventilation crowd says a wrapped hive in a warm September is a condensation box and the bees need airflow more than a coat.
My own practice has been wrapping mid-November, when daytime highs stay below freezing, with a foam board above the inner cover from October onward. But this year two respected local guys are telling me the top insulation should go on NOW and the wrap itself barely matters at all. Meanwhile a third guy overwinters with an unwrapped hive and a big upper vent and loses nothing.
So, northern folks: what actually triggers your wrap date — calendar, forecast, or temperature threshold? And has anyone actually settled the insulation vs ventilation thing to their own satisfaction, or do we all just repeat our first mentor's setup forever?
#winter-wrap#insulation#condensation#ventilation
▲ 10 votes💬 4 replies
4 replies
AlpineCarnica · Sep 6, 2026
Your two locals are right — 18 Tyrol winters brought me to the same place. The physics: warm moist air rises off the cluster, hits a cold ceiling, condenses, drips back — and wet bees at freezing temperatures die. Thick insulation ABOVE the cluster keeps the ceiling warm so moisture stays vapor or condenses harmlessly on the walls, where bees will even drink it. Top insulation has no too-early; the side wrap is a minor bonus and waits for real cold. Your big-vent man succeeds by exporting the moisture, at the price of heat. Both camps work; a cold wet ceiling is the only real enemy.
BethsBees · Sep 6, 2026
Ontario data point: last winter I did exactly what AlpineCarnica describes — 50 mm foam above the inner cover from early October, wrap in late November, tiny upper entrance, no big vent. Driest spring boxes I've had, both colonies boomed. My first year I had the classic soggy quilt and moldy outer frames with vent-everything setup. Sample size two, but I'm converted.
HokkaidoHachi · Sep 7, 2026
Hokkaido: our winters are long and snowy and nearly everyone here wraps, but the timing answer is a threshold not a date — I go when daytime highs stop reaching 5°C, because black wrap in warm sun overheats the hive and pulls bees out flying at the wrong time. That is the actual too-early risk with the wrap itself. Top insulation, I agree, has no too-early.
QuebecBees · Sep 7, 2026
So the emerging consensus is the question was wrong: top insulation now, wrap at sustained cold, and the vent argument mostly dissolves once the ceiling is warm. QuebecBees club fight, resolved by the forum in three replies. Foam boards go on this week — and AlpineCarnica, I'm stealing the warm-ceiling explanation word for word for the next meeting.