What are queen cells, and why do honey bees make them?

These cells are enlarged cells worker bees build to raise new queens during swarming, supersedure, or emergency queen-rearing in the colony.

• Queen-rearing cells are used specifically to raise developing queens.
• Developing cells normally hang vertically and develop a textured, peanut-like appearance.
• Colonies commonly raise replacement queens during swarming, supersedure, or emergency queen loss.
• Queen development from egg to adult normally takes about 16 days.
• An empty queen cup does not necessarily mean the colony is actively raising a queen.

Worker bees can rear a queen from a fertilized egg or sufficiently young female larva. The developing queen receives specialized nutrition and is raised in a larger vertical cell that extends outward and downward from the comb. Penn State Extension identifies three primary situations in which a colony naturally raises another queen: reproduction through swarming, replacement of a queen through supersedure, and emergency replacement after queen loss.

Beekeepers should also distinguish between an empty queen cup and an actively developing queen-rearing cell. Colonies may maintain empty queen cups without immediately raising a queen. When a cup contains an egg or developing larva with royal jelly, active queen rearing has begun.

Queen cell terminology at a glance

How can you tell swarm, supersedure, and emergency cells apart?

Swarm, supersedure, and emergency cells differ mainly by colony condition, timing, and placement, not by one visual clue alone.

• Swarm cells are often numerous and commonly occur near the lower edges or margins of brood comb.
• Supersedure cells are often fewer in number and may occur on the face of brood comb.
• Emergency queen-rearing cells are produced after queen loss and may be built around suitable young worker brood.
• The placement of replacement cells is evidence, not absolute proof, of the colony's intent.
• Eggs, brood condition, congestion, colony strength, and queen status provide important diagnostic context.

Swarm cells are commonly associated with a strong, growing colony preparing to reproduce by dividing. Mississippi State University Extension notes that swarm cells are commonly found on or near the lower portions of comb, while supersedure cells are generally seen on the face of the comb. Oregon State University Extension provides similar guidance.

Those patterns are valuable, but they should not be treated as rigid rules. A beekeeper should evaluate the entire colony before deciding what the queen-rearing structures mean. Look at cell number, developmental stage, brood pattern, available laying room, colony strength, food storage, and whether evidence of a functioning queen remains.

How do the three main cell situations compare?

What should you inspect when you find one?

Inspect cells by checking brood frames, cell contents, eggs, brood pattern, colony congestion, and whether the current queen is present.

• Determine whether each queen-rearing structure is an empty cup, open cell, capped cell, emerged cell, or damaged cell.
• Look for eggs and very young larvae before deciding that the colony is queenless.
• Evaluate brood pattern instead of relying entirely on physically finding the queen.
• Check whether the brood nest or honey-storage area is congested.
• Record approximately how many replacement cells are present and where they occur.
• Look for evidence that the colony may have recently swarmed.

Finding the queen can provide useful information, but it is not always necessary. A beekeeper who sees freshly laid eggs knows that a laying queen was present very recently. Young larvae and an organized worker-brood pattern provide additional information about queen status.

Inspect more than the frame containing the first queen-rearing cell. Decisions about replacement queen development should be based on what is happening throughout the brood nest. A strong colony packed with brood and adult bees tells a very different story than a small colony with a broken brood pattern and no fresh eggs.

Queen-cell inspection checklist

1. Confirm whether the structure is an empty queen cup or an active queen-rearing cell.
2. Record how many replacement cells are present.
3. Determine whether the cells are open, capped, emerged, or damaged.
4. Look for freshly laid eggs and young larvae.
5. Evaluate the brood pattern for consistency and worker brood.
6. Look for the existing queen if doing so can be accomplished without excessive disturbance.
7. Check for brood-nest congestion and available laying space.
8. Evaluate the strength and growth of the colony.
9. Write down the inspection date and observations before making an irreversible decision.

What should you do after finding queen cells?

Finding cells does not automatically require removal; first identify whether the colony is swarming, replacing a queen, or queenless.

• Do not automatically destroy every replacement queen cell you see.
• A queenless colony may depend on its emergency queen-rearing cells to produce a replacement queen.
• Supersedure can occur while the original queen is still present.
• Swarm preparation requires different management than emergency queen replacement.
• Diagnosis should come before intervention.

The safest general rule is simple: diagnose first and manipulate second. Destroying replacement cells before understanding why the bees built them can create a larger problem than the one a beekeeper was trying to solve.

If the colony appears queenless and has viable emergency cells, removing those developing queen structures could eliminate its opportunity to raise a replacement queen. If a queen remains in the hive and only a small number of replacement cells are present, the colony may be attempting supersedure. If the colony is exceptionally strong, crowded, rapidly expanding, and producing many swarm cells, swarm preparation becomes more likely.

What action fits each situation?

How should you manage swarm cells?

Swarm management works best by changing colony conditions, often with a split; simply cutting queen cells may only delay swarming.

• Swarming is a natural form of honey bee colony reproduction.
• Established swarm cells indicate that the colony has progressed substantially toward swarming.
• Removing replacement queen cells alone may not eliminate the colony's swarming impulse.
• Splitting a strong colony can redirect colony growth while creating another colony.
• Providing additional room is most useful before swarm preparation becomes advanced.

Simply cutting out developing swarm cells is not a dependable stand-alone swarm-control strategy. Mississippi State University Extension specifically notes that removing queen cells often delays swarming because colonies can build additional cells. Oregon State University Extension likewise cautions that queen-cell removal may not be sufficient once swarm cells have appeared.

A controlled split is one established option for a strong colony preparing to swarm. The basic goal is to divide colony resources in a planned way instead of allowing a swarm to leave unpredictably. The exact split method depends on whether the beekeeper wants to retain the original queen, raise a new queen, introduce a purchased queen, or reunite colonies later.

How long should you wait after queen replacement or a split?

After queen replacement or a split, allow time for emergence, mating, and egg laying before judging success, then confirm fresh eggs and brood.

• Honey bee queens normally develop from egg to adult in approximately 16 days.
• A virgin queen needs additional time to mature before mating.
• Weather can affect mating-flight opportunities.
• A colony raising its own replacement queen can experience a temporary brood break.
• Fresh eggs are one of the clearest indications that queen replacement succeeded.

Queen replacement requires patience because queen emergence is only one stage of the process. Penn State Extension reports a total queen-development period of about 16 days from egg to adult. After emergence, a virgin queen must mature, complete successful mating flights, and begin laying.

That means a colony raising its own replacement queen can go for a period without newly laid eggs. Weather can further affect the schedule because mating flights depend on suitable conditions. Opening the hive repeatedly does not make the queen mature or mate faster, so give the process reasonable time before declaring the colony hopelessly queenless.

Queen-replacement timeline

1. Queen egg laid: Development begins.
2. Queen-rearing cell capped: Development continues inside the sealed cell.
3. Adult queen emerges: Normally around day 16 from the egg being laid.
4. Virgin queen matures: She requires additional time before successful mating.
5. Mating flights occur: Timing can vary with weather and other conditions.
6. Egg laying begins: A successfully mated queen begins establishing her brood pattern.
7. Beekeeper confirms success: Look for fresh eggs followed by normally developing worker brood.

What mistakes should be avoided when managing cells?

Queen-cell mistakes include destroying cells before diagnosing the colony, assuming placement proves intent, and judging a virgin queen too quickly.

• Do not destroy all replacement queen cells before confirming queen status.
• Do not assume every queen-rearing structure along the bottom of a frame guarantees an imminent swarm.
• Do not expect additional hive space alone to reverse advanced swarm preparation.
• Do not repeatedly disturb a colony while a virgin queen is maturing and mating.
• Do not immediately interpret an absence of eggs after queen emergence as queen failure.

Managing replacement queen cells becomes risky when a decision is based on a single observation. A capped cell tells you that queen development is well underway, but the sealed queen-rearing structure alone does not explain why the colony is raising that queen.

A colony that appears queenless can also contain a virgin queen that is harder to identify than a large, established laying queen. Instead of making repeated disruptive inspections, use the colony's timeline and other evidence to decide when another inspection will actually provide useful information.

Another common mistake is assuming that every colony requires the same response. Colony population, time of year, local nectar conditions, equipment configuration, queen age, brood pattern, and the beekeeper's goals can all change the appropriate management decision.

How can better records improve future queen-cell decisions?

Detailed hive records connect queen-cell observations with colony conditions and outcomes, helping beekeepers make better decisions next time.

• Record replacement-cell number, location, and developmental stage.
• Record whether fresh eggs or the existing queen were present.
• Note colony strength, brood condition, and congestion.
• Write down any intervention that was performed.
• Return later and document whether the colony successfully requeened, swarmed, or required additional management.

Inspections involving queen-rearing cells become much more valuable when the outcome is recorded. A beekeeper who documents what was seen and then returns to record the result can gradually learn how individual colonies behave.

Write down the inspection date, number and condition of replacement queen cells, brood pattern, approximate colony strength, food stores, available space, and any manipulation performed. On a later inspection, note whether the hive remained queenright, swarmed, successfully superseded its queen, successfully raised an emergency queen, or required additional intervention.

Frequently Asked Questions?

Which sources support this guide?

The queen-development, swarm-management, supersedure, and emergency queen-rearing guidance in this article is supported by university Extension resources and Lappe's existing queen-management education.