Winterizing Your Beehive

Welcome to the final lesson of our course on the fundamentals of beekeeping. In our last session, we delved into identifying the most significant threats to colony health: Varroa mites and American Foulbrood. That knowledge is the critical foundation for this lesson, because only a healthy, robust, and low-mite colony has a fighting chance of surviving the winter.

Today, we will focus on the practical steps you must take in the autumn to prepare your hives for the cold months ahead. This process, known as "winterizing" or "overwintering," is a beekeeper's most important responsibility at the end of the season. We will cover the essential tasks of ensuring your bees have enough food to last until spring and reconfiguring and protecting the hive to shield them from moisture, cold, and pests. Think of this as preparing a self-sufficient outpost to endure a long, harsh expedition.

The Winter Survival Checklist

Successful overwintering depends on a few key conditions being met before the cold weather sets in. The goal is to create a hive that is:

1. Healthy and Populous: With a young, laying queen and, most importantly, a very low Varroa mite count. The bees that will survive the winter are raised in the late summer and fall; if they are weakened by mites and viruses during their development, the colony is unlikely to survive.
2. Well-Fed: With enough honey or sugar syrup stores to fuel the colony's winter cluster until spring nectar flows begin.
3. Dry and Draft-Free: Protected from the two biggest killers of bees in winter: moisture and wind.

With the knowledge from our previous lesson, you're already equipped to handle the first point. Now, let's focus on food and shelter.

Fuel for the Winter: Food Stores

A honey bee colony does not hibernate. Instead, the bees form a tight cluster around the queen, vibrating their wing muscles to generate heat. This requires a tremendous amount of energy, which comes from their food stores. Starvation is one of the most common, and most preventable, causes of winter colony loss.

Your primary job in the fall is to assess the hive's food stores and supplement them if necessary.

As you just read, a standard colony needs about 20 kg (roughly 45-50 lbs) of stored honey to get through winter. A Langstroth deep frame, when full of honey, weighs about 3 kg (6-7 lbs), so you are looking for at least 7-8 full deep frames of honey.

If your hive is light after you've taken your share of honey, you must feed them. Fall feeding is done with a heavy sugar syrup, mixed at a 2:1 ratio of sugar to water by weight. This high sugar concentration means the bees have to do less work to evaporate the water before capping it in the cells.

The Cornell University guide to overwintering provides further detail on the weight requirements and feeding timeline for beekeepers in North America.

There are many ways to deliver this syrup to the bees. The video below provides a good overview of the most common methods.

Once cold weather sets in, it is too late to feed liquid syrup. If a colony feels light during a mid-winter check, you must use solid food like a sugar brick or commercial fondant, which can be placed directly on top of the frames. The video below shows a practical way to set this up using a "feeder shim."

Configuring the Hive for Winter

Next, you need to ensure the hive itself is configured for maximum efficiency and survivability. This involves managing the interior space and ensuring the bees can access their food.

Key steps include:

• Consolidating Space: Bees cluster to keep warm. If a colony is small, it may struggle to heat a large, two-story hive. In such cases, it's best to consolidate the bees and all the honey frames into a single deep brood box. Too much empty space is wasted energy.
• Removing the Queen Excluder: This is crucial. The winter cluster will slowly move upwards through the hive as they consume honey. If you leave a queen excluder between the brood boxes, the cluster can move above it, leaving the queen to freeze and starve below.

Fortifying the Hive Against the Elements

A well-fed colony in a properly configured hive still faces external threats. Your final tasks are to protect it from pests, moisture, and wind.

1. Pest Protection

As the weather cools, mice look for warm, sheltered places to build their winter nests. A beehive, full of food and generating heat, is a perfect target. A mouse can quickly destroy frames and terrorize a colony.

To prevent this, you must install an entrance reducer and a metal mouse guard. The reducer makes the entrance smaller and easier for the bees to defend, while the metal guard presents a barrier that mice cannot chew through.

2. Moisture Control: The #1 Priority

It is often said that damp, not cold, kills bees. As the bees metabolize honey, they release a great deal of warm, moist air. If this moisture condenses on a cold surface inside the hive (usually the underside of the lid) and drips back down on the cluster, the wet bees will quickly chill and die.

Proper ventilation is the solution. The goal is to let this moist air escape without creating a cold draft.

• Provide an Upper Entrance: This is the most important step. A small opening at the top of the hive allows warm, moist air to vent out. If your inner cover has a notched rim, you can orient it to create this opening.
• Insulate the Top: Placing a piece of rigid foam insulation above the inner cover (but inside the telescoping outer cover) keeps the ceiling of the hive warmer. This encourages condensation to form on the cooler hive walls instead, where it can run down and out the entrance.
• Tilt the Hive: A slight forward tilt of the hive (an inch or so) ensures any condensation that does form will run towards the front and out the entrance, not pool on the bottom board.

The University of Guelph video provides a concise summary of these ventilation and insulation principles.

3. Insulation and Wrapping

While top insulation is for moisture control, wrapping the hive bodies with a material like black roofing paper (tar paper) serves two functions:

• It creates a draft barrier, which is especially important if your wooden boxes have gaps.
• The black surface absorbs solar radiation on sunny days, helping to warm the hive wall slightly.

This is less about adding a high "R-value" of insulation and more about wind protection and passive solar gain.

The "Beekeeping 101" video shows a great, practical application of putting all these pieces together.

Conclusion and Course Wrap-up

Preparing your bees for winter is the culmination of your season's work. By ensuring your colony is healthy, well-fed, and housed in a dry, draft-free home, you give them the best possible chance of emerging strong and ready for the spring.

Key Takeaways for Winterizing:

• Start with a healthy, queen-right colony with a low Varroa mite load.
• Ensure at least 20 kg (45-50 lbs) of food stores, and supplement with 2:1 sugar syrup in the fall if needed.
• Consolidate the hive to a size the bee cluster can effectively heat.
• ALWAYS remove the queen excluder.
• Install a metal mouse guard to protect the entrance.
• Prioritize moisture control with top insulation and an upper entrance for ventilation.
• Wrap the hive to block drafts and gain some solar heat.

This lesson marks the end of our introductory journey into beekeeping. We've moved from understanding the inhabitants of the hive—the queen, workers, and drones—to the practicalities of equipment, hive inspections, health management, and finally, seeing the colony through the cycle of a full year.

You now have the foundational knowledge to begin. However, beekeeping is a hands-on skill best learned through experience. As a next step, I strongly encourage you to connect with a local beekeeping association. There you will find mentors and peers who can guide you through your first season, answer location-specific questions, and share the practical wisdom that can only come from experience.

Thank you for your dedication to learning. I wish you the very best on your beekeeping adventure