Working the seasons

Preparing for winter

Updated October 2026

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What actually kills them Weight is the measurement Winter bees are made in late summer Damp Reducing the space What not to do References

Colonies rarely freeze to death. They starve a few inches from honey, or they go into winter with bees that were damaged before they emerged, and both of those are decided in August and September rather than in January.

What actually kills them

Starvation, often with stores still in the hive that the cluster could not reach.
Varroa damage to the bees that had to last all winter.
Damp, which is worse than cold and almost entirely preventable.
Queenlessness going into winter, which is unrecoverable.

Cold on its own is well down the list. A dry, well-provisioned colony with healthy bees survives weather that sounds impossible.

Weight is the measurement

Lift the back of the hive. That single action tells you more than any inspection, and it is what all the published guidance is ultimately a proxy for. The figures differ by source and by climate, which is worked through on how much honey to leave the bees.

If it is light, feed heavy syrup while the weather still allows the colony to take it down and cure it.

Winter bees are made in late summer

The bees that overwinter are raised in late summer and early fall, and they are physiologically different from summer bees. They live for months rather than weeks. If varroa levels are high while those bees are developing, they emerge damaged and the colony dies in February with food still in the box. That is why the late summer mite treatment is the one that decides the winter.

Damp

A cluster produces moisture. In a sealed hive that moisture condenses on the cold inner cover and drips back onto the bees, which is far more dangerous than dry cold.

Upper ventilation, a slight forward tilt so condensation runs out rather than down, and an absorbent layer above the cluster all address it. Wrapping a hive without ventilating it makes the problem worse rather than better.

Reducing the space

Take off empty supers. A colony heats the cluster, not the hive, but a large volume of empty space increases air movement and gives pests room to work. Reduce the entrance, both for warmth and to keep mice out, which is what a mouse guard is for.

What not to do

Do not open the hive to check. Every inspection in cold weather breaks the cluster and costs stores. Heft the back, watch the entrance on a warm day, and leave them alone.

References

Penn State Extension. Honey Bee Management Throughout the Seasons. extension.psu.edu

eXtension Bee Health. Seasonality of Brood and Adult Populations; Beekeeping Equipment. bee-health.extension.org

University of Georgia Extension. Honey Bees and Beekeeping (B1045). extension.uga.edu

Written from published extension guidance, not from a laboratory. Local climate, local forage and the state of your particular colony override anything general said here.