Preparing Bee Colonies for Successful Overwintering: Key Practices

Autumn is the most consequential season in a beekeeper’s calendar. What you do – or don’t do – between late summer and the first frost largely determines whether your colonies survive winter and bounce back strong in spring. In areas where floral resources dry up after the main honey flow, colonies can’t fend for themselves. Good fall management is critical to successful overwintering, and it needs to start before temperatures drop too low to take corrective action. This post covers every key step: queen status, colony strength, hive space, food stores, and pollen – everything a colony needs to make it through.

Why autumn preparation matters so much 🔗

Winter is physiologically the hardest period in a honey bee colony’s annual cycle. With brood rearing halted and foraging impossible, survival depends entirely on internal resources and energy efficiency. The winter cluster must maintain a stable core temperature of around 35°C using nothing but stored honey and the metabolic heat generated by worker bees vibrating their flight muscles. A colony that enters winter short on bees, food, or a healthy queen is unlikely to come out the other side.

The problem is compounded in regions where autumn brings limited or no nectar flow. Bees can’t top up their own stores, which makes beekeeper intervention not optional – it’s essential. Nearly 40% of managed colonies fail to make it through winter, a figure that underscores just how much is at stake if preparation is inadequate.

Start with a queen assessment 🔗

Before anything else, confirm that every colony has a healthy, productive queen. Colonies must be strong, healthy, and have a productive queen when entering winter – a vigorous queen ensures enough bees are reared in autumn to form a cluster large enough to generate and retain heat through the cold months.

The bees that will overwinter are not the same summer workers that foraged all season. They are a special cohort of winter bees – longer-lived individuals with well-developed fat bodies that serve as energy reserves and immune regulators. These bees are produced from the last few rounds of autumn brood. The last couple of rounds of brood reared in autumn are critical for colony winter survival, since it is those bees that will form the winter cluster. A failing or absent queen cuts off that production entirely.

When to requeen 🔗

Early autumn requeening – before mating conditions deteriorate – gives the new queen time to establish herself and contribute to winter bee production. Requeening in early fall can be done because this ensures a healthy, productive queen for the winter. In colder climates, virgin queens emerging late in the season may fail to mate successfully, so don’t delay if a colony shows signs of a failing or absent queen – spotty brood, no eggs, or an aging queen with a poor laying pattern are all red flags.

Reduce hive space to match colony size 🔗

As autumn progresses, bee populations naturally decline. Drones are expelled, worker numbers drop, and the cluster contracts. A hive with too much empty space becomes a liability: the bees must heat a larger volume with fewer bodies, wasting precious energy reserves. Make the space inside the hive commensurate with the size of the colony. If necessary, reduce the hive volume with follower boards.

Remove any empty supers once the honey harvest is done. For smaller colonies, consolidate frames and reduce the hive down to a single brood box if needed. If there is too much empty space relative to the size of the cluster, the bees may struggle to keep it warm. Also remove any queen excluders at this point – if the cluster migrates upward through the hive in search of food stores, the queen must be able to move with it. An excluder left in place can trap her below and leave her to perish.

Unite weak colonies with stronger ones 🔗

A colony that cannot field enough bees to form an adequate cluster will not survive winter, no matter how well-fed it is. A healthy colony consisting of 25,000 to 30,000 bees is an adequate size for overwintering success. Colonies with fewer than 15,000 bees are not likely to survive freezing temperatures. Any colony significantly below this threshold should be united with a stronger one rather than overwintered independently.

In the early autumn, hopelessly weak colonies should be combined to avoid losing hive equipment to pests like the small hive beetle or the greater wax moth. The result is a single, robust colony with a better chance of surviving than either unit would have alone.

The newspaper method 🔗

The most widely used technique for uniting colonies is the newspaper method. Two colonies must be combined slowly and systematically so that the hive odors merge gradually. Place a single sheet of newspaper over the top bars of the stronger colony, make a few small slits in it with a hive tool, then set the weaker colony’s box on top. The bees chew through the paper slowly, allowing their colony scents to blend before they physically meet – reducing fighting and improving acceptance. Within a day or two, the colonies merge into one stronger unit.

One critical rule: never unite a diseased colony with a healthy one. Care should be taken if combining a poorly performing colony with a stronger one, as there may be underlying disease in the weaker colony that is then passed on to a healthy one. Always investigate the cause of weakness before proceeding. If disease is present, treat it first.

Ensuring adequate food stores 🔗

Food shortage is one of the leading causes of winter colony death. Generally, there should be about 90 pounds of honey reserves for a colony in the North, because bees will not be able to forage in the winter. For a standard Dadant hive, beekeepers are advised to ensure a minimum of 15 to 20 kg of honey stores are available, corresponding to three to four frames fully capped on both sides.

A quick and practical way to gauge stores without opening the hive is the heft test: try lifting one side of the hive with one hand. If it resists easily, stores are likely sufficient. If it lifts with little effort, supplemental feeding is needed.

Feeding with heavy sugar syrup 🔗

When natural stores are insufficient, supplement with sugar syrup before temperatures drop too low for bees to process and store it. In autumn, always use a heavy syrup – a 2:1 ratio of sugar to water by weight. It is important to ensure fall feed has a higher sugar content, as the bees will be able to ripen it quickly for storage. If the stored syrup has too high a moisture content, it can cause dysentery – a common cause of winter colony death.

A heavier syrup requires less energy for bees to remove moisture, reducing the burden on an already contracting colony. Feeding must be completed while temperatures are still warm enough for bees to fly and process the syrup – generally before temperatures consistently fall below 10°C (50°F). Watch out for robbing bees during supplementary feeding; feeding in the evening and quickly cleaning up spills will help prevent robbing.

Once feeding is complete, heft the hive again to establish its target winter weight. Check periodically through winter and provide fondant or candy boards as emergency feed if the hive becomes noticeably lighter.

Pollen stores: the overlooked requirement 🔗

Sugar syrup provides carbohydrates, but that’s only part of the equation. Bees also need protein – primarily from pollen – to rear the brood that becomes the winter bee cohort. Pollen dearths are especially critical in autumn when the winter bees are developing. Lack of pollen will reduce brood production even if you have plenty of nectar or honey.

Inspect frames for stored pollen (beebread). In a well-stocked hive, pollen-filled cells should surround the brood area, with capped honey on the outer frames. If pollen stores are sparse and natural pollen sources are exhausted for the season, provide a pollen substitute in the form of protein patties placed directly on the top bars over the brood nest.

Why pollen quality matters for spring 🔗

Research underscores just how much autumn pollen affects the following spring. A study conducted on behalf of Project Apis M demonstrated that bees fed protein in the fall performed better in the following spring, with colonies having access to pollen showing higher survival rates. Well-nourished winter bees enter dormancy with fuller fat bodies, stronger immune systems, and greater physiological resilience – all of which translate directly into spring colony strength.

In areas with a reliable autumn pollen flow from plants like goldenrod or asters, colonies may not need supplemental protein. But where autumn is florally barren, pollen substitute feeding is a worthwhile investment that pays dividends well into the following season.

A checklist before the cold sets in 🔗

As a final review before winter officially arrives, go through each hive and confirm the following:

• Queen status: Colony is queenright with a young, productive queen and a solid brood pattern.
• Colony strength: Population is large enough to form an adequate cluster; weak colonies have been united.
• Hive space: Empty boxes and frames have been removed; space matches colony size.
• Food stores: Honey or stored syrup is sufficient and properly positioned above and around the cluster.
• Pollen: Beebread is visible on frames adjacent to the brood; pollen substitute provided if stores are low.
• Varroa levels: Mite loads have been treated before the winter bee cohort was reared.
• Entrances: Reduced to prevent heat loss and deter mice and other pests.

Even when all appropriate preparations are taken, some colonies still may not survive – colony death is a reality of beekeeping. But with thorough autumn management, losses can often be reduced below 10%, and the colonies that do make it through will be positioned to thrive from the first spring bloom onward.

What do you think? Given that autumn preparation begins well before the first frost, at what point in the season do you consider it too late to make meaningful changes to a struggling colony – and how do you decide between requeening, uniting, or simply providing supplemental feed?

References

1. https://cals.cornell.edu/pollinator-network/beekeeping/overwintering
2. https://www.blog-veto-pharma.com/en/preparing-for-winter-the-keys-to-ensuring-honeybee-colony-survival/
3. https://bestbees.com/overwintering-honey-bees/
4. https://edis.ifas.ufl.edu/publication/IN1006
5. https://scientificbeekeeping.com/understanding-colony-buildup-and-decline-part-12/
6. https://www.honeybeesuite.com/the-ultimate-guide-to-overwintering-success/
7. https://www.nationalbeeunit.com/assets/PDFs/3_Resources_for_beekeepers/Fact_Sheets/Fact_19_Preparing_your_hives_for_winter.pdf
8. https://extension.msstate.edu/publications/colony-growth-and-seasonal-management-honey-bees
9. https://www.betterbee.com/instructions-and-resources/using-newspaper-to-combine-two-colonies.asp
10. https://www.ontariobee.com/sites/ontariobee.com/files/GuideFeedingBees.pdf
11. https://www.beepods.com/fall-feeding-made-easy/
12. https://www.beeculture.com/feeders/
13. https://usa.hivealivebees.com/blogs/news/fall-feeding-for-bees-preparing-colonies-for-winter-survival
14. https://www.honeybeesuite.com/overwintering-success-managed-colonies/