Preparing Your Hive for Winter

Most colonies that die in winter do not die of cold. They die of starvation, moisture, or the delayed consequences of a mite population that was never brought under control. Winter preparation is therefore mostly about food, airflow and mites — not insulation.

How a colony actually survives winter

Honey bees do not hibernate. They form a tight cluster around the queen and generate heat by shivering their flight muscles, holding the cluster core near 20 °C while the outside temperature drops well below freezing.

The cluster expands and contracts with temperature, and it moves slowly across the comb, consuming stores as it goes. Two consequences follow. First, the colony must be able to reach its food — a cluster cannot cross a gap of cold comb. Second, the cluster produces a great deal of water vapour, and if that vapour condenses above the cluster and drips back down, the bees get wet. Wet bees die at temperatures dry bees survive.

Step one: stores

This is the step that decides the outcome, and it is the one people get wrong most often.

Heft the hive from the back. A colony with adequate stores feels heavy and solid; one that tips easily is light. A hive scale removes the guesswork and shows you the consumption rate through the winter, which is genuinely useful.

Feed 2:1 syrup in early autumn, well before the cold arrives, so the colony has time to process and cap it. Late feeding leaves uncapped, high-moisture stores that can ferment.

Step two: mites

The winter bees — the long-lived generation that carries the colony through to spring — are reared in late summer and early autumn. If mite pressure is high during that period, those bees are born immunosuppressed and virally infected, and they will not live long enough to do their job.

This is why the late-summer mite treatment is the most important of the year. Treat after the honey harvest, retest two to four weeks later, and treat again in the broodless winter window if the load is still high.

Step three: ventilation and moisture

• Upper ventilation: a small vent, an upper entrance, or a quilt box. Warm damp air must have somewhere to go.
• Quilt box: a shallow box filled with absorbent material above the inner cover. It traps rising moisture before it condenses on the ceiling.
• Screened bottom board: helps air move through the hive and provides a lower exit for moisture.
• Entrance reducer: set to the smallest opening, turned so the notch is at the top. Reduces draft while maintaining airflow.
• Forward tilt: tilt the hive 5–10 mm forward so condensation runs out of the entrance rather than pooling.

Step four: wind protection and wrapping

Wind is what actually chills a cluster. A wrap helps most in cold, wet, windy regions, and helps least in mild ones where it can trap moisture.

• Tar paper or an insulated jacket around the sides and back. Leave the entrance completely clear.
• Never seal the hive airtight. Ventilation is not optional.
• Secure the wrap. Wind removes tar paper with enthusiasm.
• In mild climates, prioritise windbreak and ventilation over insulation.
• A windbreak — a hedge, a fence, a stack of straw bales — is often more effective than any wrap.

Step five: mice and other visitors

A mouse can enter through a gap of about 10 millimetres and will happily overwinter inside a hive, eating stores and fouling comb. Fit a mouse guard as soon as the nights turn cold, before mice start looking for shelter.

Check the guard every few weeks. A guard blocked by dead bees or snow stops ventilation and does more harm than the mouse it was fitted for.

The winter preparation checklist