Should A Screened Bottom Board Be Closed During Winter? Expert Winterization Tips For Hives

The decision to close a screened bottom board during winter relies heavily on your specific local climate. In milder southern regions, leaving the screen open is standard practice, whereas in colder northern regions, beekeepers must weigh the benefits of ventilation against the risks of extreme drafts.

While many northern beekeepers successfully winter with open screens to reduce moisture, those in extremely frigid climates often choose to close the screen or switch to solid boards to prevent wind from stripping heat from the cluster.

Analyzing Climate Impact

Strategies for Southern Regions

In milder or southern climates, closing the screened bottom board is generally not essential. The ambient temperatures rarely drop low enough to threaten the cluster through the open mesh.

Leaving the screen open ensures adequate airflow. However, if you are concerned about occasional cold snaps, you can insert the mite count board to temporarily block drafts without changing the hive structure.

Strategies for Northern Regions

In colder northern areas, the approach is more nuanced. Contrary to popular belief, many beekeepers in these regions continue to use screened bottom boards open throughout the winter.

The bees are highly efficient at clustering to maintain warmth. An open screen prevents moisture buildup, which can often be more deadly to a winter cluster than the cold itself.

Managing Extreme Cold

There is a limit to what an open screen can handle. In climates defined by "extremely frigid" temperatures, the heat loss through the bottom may become unsustainable for the colony.

In these specific severe conditions, beekeepers often intervene. This may involve closing the screen using an insert or physically switching the hive to a solid bottom board for the season.

Understanding the Trade-offs

Drafts vs. Ventilation

It is critical to distinguish between helpful ventilation and harmful drafts. An open bottom board provides ventilation, which helps exhaust the condensation created by the bees' respiration.

However, if wind blows directly into the hive components, it becomes a draft. A draft disrupts the thermal envelope of the cluster, forcing bees to consume more honey stores to stay warm.

The Component Swap

The primary reference notes that some beekeepers switch to a solid bottom board for winter. While effective for insulation, this is labor-intensive.

Using a sliding insert (often the mite count board) allows you to close the screen easily. This offers the protection of a solid board without the physical exertion of lifting the hive body.

Making the Right Choice for Your Goal

To determine the best configuration for your apiary, assess your typical winter severity.

If your primary focus is operating in a mild southern climate: Leave the screen open, as closing it is not necessary for colony survival.
If your primary focus is a standard northern winter: You can likely leave the screen open to mitigate moisture, provided the hive is shielded from direct wind.
If your primary focus is surviving extremely frigid sub-zero temperatures: Insert the mite board or switch to a solid bottom to seal the hive against drafts.

Beekeeping is local; observe how your specific colonies react to wind and adjust your equipment to minimize stress on the cluster.

Summary Table:

Climate Type	Bottom Board Status	Primary Benefit
Mild/Southern	Leave Open	Maximizes airflow; minimal cold risk
Moderate Northern	Open (with windbreak)	Reduces moisture buildup and condensation
Extremely Frigid	Closed / Solid Board	Prevents heat loss from the winter cluster
Variable/Transition	Use Insert Board	Easy adjustment for sudden cold snaps

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