Getting Your Bees Through an Alberta Winter: What's Really Important?

If you've struggled to get your colonies through an Alberta winter, it's time to take a closer look at your fall management.

Every spring, beekeepers open their hives hoping to find healthy colonies ready to build up for the season ahead. Unfortunately, winter losses are a reality for many Beekeepers. And while Alberta's long, cold winters certainly don't make things easy, there are often management decisions made in late summer and early fall that can make a significant difference to whether our bees survive until spring.

The three big things we need to get right before winter are Varroa mite management, adequate food stores, and a strong, healthy queen heading up the colony.

Ideally, we're monitoring and treating for mites in late summer, getting our colonies fed before temperatures drop, and assessing colony strength well before the bees settle into their winter cluster.

But let's be honest. Beekeeping seasons get busy, weather doesn't always cooperate, and sometimes fall arrives before we're ready for it.

If you're looking at your hives and feeling like you've fallen behind on your winter preparations, don't panic. There are still steps you can take to give your bees a better chance.

Let's look at what matters most and what you can do if you're playing catch-up.

1. Feed fondant: Give your bees a backup food supply

One of the simplest things you can do late in the season is provide your colonies with fondant or a candy board.

By late fall, it's generally too cold for bees to process liquid sugar syrup efficiently. Feeding syrup when temperatures are too low can increase moisture in the hive and put additional demands on the colony. Solid sugar feed offers a practical alternative when the bees need supplemental carbohydrates.

Why is this so important in Alberta?

Our winters can be long, and a colony can consume a surprising amount of food before spring forage becomes available. Even if your bees went into winter with what looked like adequate stores, they may use those reserves faster than expected. During a prolonged cold spell, the cluster may also be unable to move far enough to reach honey stored elsewhere in the hive.

Fondant or a candy board placed above the winter cluster gives your bees another accessible food source when they need it.

What should you do?

• Check your colonies' weight to get an idea of their remaining food stores.

• Add bee-safe fondant or a candy board above the cluster, where the bees can reach it.

• Make sure your hive setup accommodates the extra feed without compromising your insulation or moisture-management plan.

• Check feed consumption when weather conditions allow, without unnecessarily disturbing the cluster. Remember, the more warm chinook days we have the more active the bees are. This will cause higher than expected food consumption.

Remember, fondant isn't a substitute for adequate winter stores. Think of it as an emergency backup rather than the main food supply.

2. Don't overlook Varroa mites — even if it's late

If there's one thing I want every beekeeper to take seriously, it's Varroa mite management and monitoring.

Varroa mites aren't simply another pest to keep an eye on. They feed on honey bees' fat body tissue and transmit viruses that can seriously compromise bee health. These effects are particularly damaging to the long-lived winter bees your colony depends on to survive until spring.

The problem is that by the time you notice a colony struggling, the damage may already have been done.

Winter bees begin developing in late summer. When mite levels are high during this critical period, those bees can enter winter with reduced longevity and compromised health. A colony can look reasonably strong in September and still struggle badly by January.

The Alberta Beekeepers Commission emphasizes the importance of regular mite monitoring, while the Canadian Food Inspection Agency warns that late-season treatments can be less effective than treatments applied earlier.

Ideally, we monitor and treat in late summer, then check mite levels again to confirm that our treatment worked.

But what if you missed that window?

If your colonies haven't received an effective mite treatment, don't assume it's too late to do anything. Assess your situation and choose an appropriate treatment rather than leaving a potentially serious infestation unmanaged.

Oxalic acid vaporization is a good late-season option!

Oxalic acid vaporization, also called sublimation, is one option worth considering late in the season, particularly when little or no capped brood remains in the colony.

Oxalic acid works primarily against mites on adult bees. It does not reliably kill mites protected beneath the capped brood cells. This means its effectiveness depends heavily on the colony's brood status.

When a colony is broodless or has very little brood, a greater proportion of the mites are exposed on adult bees, making oxalic acid a useful treatment option.

However, there are a few important considerations:

• Check brood status. If capped brood is still present, mites may be protected from the treatment. Don't assume a single application will provide complete control.

• Choose a treatment appropriate for current conditions. Temperature, colony condition, brood levels, and the product's registered directions all matter.

• Use only a product and application method registered for use in Canada. Follow the current label exactly.

• Protect yourself. Oxalic acid vapour is hazardous to inhale. Use the required respiratory protection, eye protection, and other personal protective equipment, and follow the vaporizer manufacturer's safety instructions.

Oxalic acid vaporization can be a practical late-season option, but it isn't automatically the best choice for every hive. If brood is still present or your colonies have very high mite levels, you may need a different or additional treatment strategy.

For current treatment guidance, consult the Alberta Beekeepers Commission's 2026 Varroa Treatment Factsheet and Varroa Decision Tree.

The takeaway? Don't skip mite management just because the calendar says fall is nearly over. Do the assessment, choose a suitable treatment, and make sure you understand its limitations.

3. Assess your queen and colony strength

Food and mite control are critical, but they aren't the whole picture. The quality of the queen and the strength of the colony also have a major influence on winter survival.

A colony needs enough healthy bees to maintain its winter cluster, regulate its temperature, and survive the long stretch until spring brood rearing and forage become sustainable.

A weak colony may struggle to maintain heat and consume its stores less efficiently. A colony with a failing queen may also enter winter without the healthy population structure it needs.

Ideally, we assess queen performance and colony strength well before fall. If a colony needs requeening or other corrective management, it's generally much better to address that earlier in the season.

If you're already late in the fall, your options may be more limited, but there are still useful questions to ask:

• Is the population large enough to form and maintain an effective winter cluster?

• Are there signs of disease or other problems that could compromise winter survival?

• Is there a clear management reason to consider combining a weak colony with a stronger one?

Don't assume that every weak colony should be combined, or that combining colonies late in the season is always the right answer. Disease status, queen quality, available bees, and local conditions all need to be considered.

The important thing is to assess each colony honestly. Sometimes the best decision is to intervene; sometimes it's to avoid further disturbance and focus on giving the colony the best possible winter conditions.

4. Don't forget insulation and moisture management

Once you've addressed food and mites, make sure your hive is properly prepared for the cold.

Alberta winters can bring extended periods of severe cold, and colonies need suitable protection from the elements. But winter preparation isn't simply a matter of wrapping a hive as tightly as possible.

Your setup needs to balance insulation, protection from wind and precipitation, and appropriate moisture management.

Check that:

• Your winter wrap or insulation is properly installed and suited to your hive system.

• The top of the hive has appropriate insulation.

• The roof is weatherproof and water isn't entering the hive.

• Moisture has a suitable way to escape, according to your chosen wintering configuration.

• Entrances are protected against mice while maintaining the airflow required by your setup.

Moisture management is especially important. Warm, moist air produced by the cluster can condense on cold surfaces, and excessive moisture can contribute to winter losses.

There isn't one universal insulation or ventilation configuration that suits every hive and apiary. Consider your equipment, exposure, and local conditions, and use a wintering approach that has been shown to work in your environment.

5. Learn from this season and plan for the next

If you've lost colonies in the past, it can be tempting to blame the weather. And yes, Alberta weather can certainly be challenging. But reviewing your management is one of the most useful things you can do.

When you find a dead colony, take time to investigate the likely cause rather than assuming it starved or froze.

Consider:

• Were there adequate food stores remaining?

• Was the cluster positioned near accessible food?

• Did you monitor Varroa levels before and after treatment?

• Was the colony strong enough going into winter?

• Were there signs of queen failure, disease, or excessive moisture?

Keep records of your mite counts, treatment dates, feed amounts, and spring outcomes. Over time, these records can help you identify patterns across your own apiary.

The bottom line

Getting colonies through an Alberta winter starts well before the snow flies.

Mite monitoring and treatment, adequate food stores, and a strong, healthy queen are the foundations of successful winter management. Insulation and moisture management help support the colony through our long, cold winters, too.

If you've fallen behind this year, don't give up. Provide emergency solid feed if needed, assess your mite situation and treat appropriately, and make sure your colonies are prepared for the conditions ahead. These steps can't undo damage already caused by mites or poor colony health, but they can still help address problems that remain manageable.

And when spring arrives, take what you've learned into the next season. Start monitoring mites earlier, make a feeding plan, and assess colony strength earlier before fall catches up with you.

We know that beekeeping is a learning process. Every season teaches us something, and the goal is to keep building on that knowledge so we can give our bees the best chance possible.

If you're unsure about your winter management, reach out to an experienced local beekeeper or join us for one of our educational sessions. Sometimes a second set of eyes and a conversation about your management plan can make all the difference.

Here's to healthy bees and a successful spring!