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Preparing beehives for winter

Most colonies that die over winter were actually lost in the autumn — to too few stores, too many mites, or a failing queen. Bees survive cold remarkably well; what they can't survive is starvation, disease, or damp. Winterizing is really about getting these few things right before the cold sets in.

The winterizing checklist

Confirm a strong, laying queen. A colony heading into winter needs a healthy queen and a good population of young bees. A small or queenless colony rarely makes it — consider combining weak colonies into one strong one.
Get the mites down first. This is non-negotiable. Treat for varroa in late summer/early autumn so your winter bees are reared healthy. High mite loads are the most common hidden cause of winter loss.
Check food stores — by weight. Heft the hive from the back; it should feel heavy and solid. Depending on climate a colony may need roughly 15–25 kg (35–55 lb) of stores. If light, feed thick (2:1) sugar syrup early while it's still warm enough for bees to take and cure it; switch to fondant once it's cold.
Reduce the entrance and fit a mouse guard. Mice move into warm hives and wreck comb. A small entrance is also easier for fewer bees to defend against robbing and wasps.
Provide ventilation to beat damp. Condensation dripping onto the cluster is deadlier than cold. A slight upper vent or a quilt/insulation board above the cluster lets moisture escape while keeping the bees warm.
Insulate the top, not just the sides. Most heat is lost upward; insulation over the crown board makes the biggest difference.
Secure against wind and wildlife. Strap or weight the lid, tilt the hive slightly forward so water drains out, and protect from prevailing wind. Use an entrance reducer or robbing screen if wasps are active.

Once it's cold: leave them be

Resist opening the hive in winter — every inspection breaks the cluster's heat. Instead, monitor from outside: heft for weight every few weeks, watch for cleansing flights on mild days, and keep the entrance clear of dead bees and snow so they can ventilate and take a cleansing flight when they get the chance.

Winter survival comes down to a few autumn decisions: stores, mites, and queen strength per colony. I built HiveLog, a free hive log, so you can record each hive's stores level, final mite count and queen status going into winter — and know in spring which prep actually worked.

Open HiveLog — free →