By Austin Little
Hold one frame up to the light and it tells you whether you have a laying queen, how the colony is growing, and whether something is wrong. Here's how to read it, stage by stage.
AI disclosure. This page was drafted with AI assistance and edited for Apiary. We don't invent quotes, stats, people, or events. If something looks off, tell Austin — that's the point of a living hive.
Here's the short answer. A frame of brood shows three stages of developing bees. Eggs are tiny white grains standing in the bottom of cells. Larvae are white, C-shaped grubs lying in a bit of milky food. Capped brood is pupae sealed under tan or brown wax caps. If you see eggs, a queen has been laying in the last few days. If you see all three stages in a tight, mostly unbroken pattern, the colony is probably queenright and building normally. Gaps, odd cappings, discolored larvae, or more than one egg per cell are what you need to look into.
You don't need to find the queen on every inspection. Reading the brood tells you more about her than seeing her does. The rest of this guide explains how.
Why brood is the most important thing you look at
A colony is its brood. Today's eggs become the foragers that bring in nectar a few weeks from now. When you read brood, you're reading the colony's past few weeks and its next month at the same time.
A brood frame answers the core inspection questions:
- Is there a laying queen? Eggs and young larvae say yes, recently.
- Is she laying well? A solid, even pattern says probably.
- Is the colony growing, holding, or shrinking? The amount of brood across frames tells you.
- Is something wrong? Disease, mites, a failing queen, and laying workers all show up in the brood before most other places.
- Is the colony preparing to swarm or replace the queen? Queen cells usually sit on or around brood frames.
So when a mentor says "go read the brood," they mean the whole inspection is in there.
Before you start: how to hold a frame so you can actually see
A lot of beginners can't find eggs. That's usually not about eyesight. It's about how they hold the frame and where the light is.
Hold the frame over the open box. If the queen is on it and falls off, she drops back into the hive instead of into the grass.
Keep the frame vertical. Lift it straight up by the end lugs. Turning it flat can make fresh nectar drip out and can stress soft new comb in hot weather. To see the other side, turn it like a page in a book: rotate it around its vertical axis while keeping it upright.
Put the sun behind you, over your shoulder. Tilt the frame so light falls straight into the cells. Eggs show up best when light reaches the cell bottoms. A bright overcast day is often easier than harsh noon sun.
Look straight down into the cells, not across them. Eggs sit at the bottom. You need to look along the axis of the cell.
Take your time on one frame instead of rushing through ten. Reading one frame well beats skimming every frame poorly.
Readers help. If your eyes aren't what they were, a cheap pair of reading glasses or a magnifier inside your veil can make eggs much easier to see.
The geography of a brood frame
Before you look at single cells, look at the whole frame. In a typical healthy colony, a brood frame is laid out in rough bands:
- An arc of honey across the top corners, often capped with white, dry-looking wax.
- A band of pollen just below the honey, packed in cells in different colors: yellow, orange, gray, sometimes red or green depending on what's blooming.
- Brood in the middle and lower part of the frame, in a rough oval or rainbow shape.
The center frames of the brood nest usually carry the most brood. Frames toward the outer walls carry less brood and more food. If you pull from the outside in, you'll usually hit honey and pollen first, then brood.
This layout isn't a law. Colonies vary, and the season changes it. It's still a good baseline, and noticing when a colony departs from it is part of reading brood. For example, if nectar is packed into the brood nest where the queen should be laying, that can mean crowding. In spring, that can be an early swarm signal.
Stage one: eggs
What they look like: A honey bee egg is a tiny white oblong, shaped a bit like a miniature grain of rice. It sits at the bottom center of a cell. It's small enough that beginners often miss it entirely.
How they sit: A newly laid egg usually stands roughly upright, attached at one end to the cell base. Over the next few days it tilts and ends up lying down before it hatches.
How long they last: Worker, drone, and queen eggs all take about three days to hatch. That's the useful bit. If you see eggs, a laying queen was in the colony within about the last three days. You don't have to see her.
One egg per cell, centered on the bottom. That's normal. If you see two, three, or more eggs in one cell, or eggs stuck to the cell walls instead of the bottom, see the "red flags" section below.
Where to look: Eggs are usually near the edge of the brood area, where the queen has been working most recently, or in cells that were just cleaned after bees emerged. Look in shiny, polished, empty-looking cells near young larvae.
Darker comb helps. White eggs show up more easily against older, darker comb than against pale new wax.
Stage two: larvae (open brood)
What they look like: After the egg hatches, a larva lies at the bottom of the cell in a small pool of milky white food. A young larva is tiny and almost see-through. As it grows, it curls into a glossy, pearly-white "C" shape and gets larger until it fills the bottom of the cell.
How long: Worker larvae stay uncapped for several days after hatching, roughly six days, before the workers seal the cell.
What healthy larvae look like:
- Bright, pearly white
- Glossy and plump
- Curled in a neat C at the bottom of the cell
- Sitting in visible brood food when young
- Segmented, with no lumps or discoloration
What to note: The size range of larvae tells you continuity. If you see very young larvae (tiny, in lots of food) and big ones (filling the cell), the queen has been laying steadily for days.
Young larvae and the queen question: Very young larvae, only a day or so old, are another sign of a recently laying queen. They also matter for emergencies. A colony that loses its queen can raise a new one from a very young worker larva. That's why mentors sometimes tell you to give a queenless colony a frame with eggs and very young larvae from another of your healthy colonies.
Stage three: capped brood
What it looks like: Once the larva is fully grown, workers seal the cell with a porous wax cap. Under it, the larva spins a cocoon and changes into a pupa, then into an adult bee.
Worker brood cappings are usually:
- Tan, light brown, or a biscuit color. The shade varies with the comb and the colony.
- Slightly domed or close to flat.
- Matte, with a slightly rough, porous texture. Brood cappings let air through.
- Laid out in a fairly solid patch.
Drone brood cappings are bigger and much more domed. People often describe them as bullet-shaped or as raised bumps. Drones develop in larger cells and take longer to emerge. Drone brood is usually around the edges and bottom of frames. (Apiary has a separate guide on drone brood vs worker brood.)
How long: Capped worker brood usually stays sealed for about twelve days before the adult bee chews her way out. That means capped brood tells you about laying that happened well over a week ago. Eggs and larvae tell you about this week.
Honey vs brood cappings: Beginners mix these up a lot. Capped honey is usually whiter, smoother, and more waxy-looking, and it's normally in the top arc of the frame. Capped brood is darker, more matte, and in the middle and lower part. If you aren't sure, look at where it is on the frame and compare it with the cells around it.
Putting the stages together: what the mix tells you
Once you can identify each stage, read them together.
All three stages present, in a solid pattern This is what you want to see. The queen is laying, has been laying steadily, and the colony is raising brood on schedule.
Capped brood and larvae, but no eggs Possibilities:
- You missed the eggs. Look again with better light.
- The queen stopped laying recently. This happens during a dearth, in late season, or after a disturbance.
- The queen is gone. She may have swarmed, died, or been crushed during an earlier inspection.
- The colony is raising a new queen, and the new one hasn't started laying yet.
Look for queen cells. Check other frames. Re-check in about a week.
Capped brood only, no eggs or larvae This often means the colony has been without a laying queen for more than about a week. Common reasons are a swarm, the loss of the old queen, or a new queen not yet laying. Look for queen cells, empty or capped, and for a virgin queen. Talk to your mentor before making any big moves. Sometimes the colony is fine and just in the gap before a new queen starts laying.
Eggs and larvae, but very little capped brood Often a new queen who just started laying, or a colony that recently had a broodless break. Usually fine. Check again in a week or two to see the capped brood fill in.
No brood at all This can be normal in some seasons and climates. Some colonies take a winter break from brood rearing. During the active season, it calls for a closer look at queen status. In some climates it's also expected during a deep dearth.
Reading the brood pattern
"Brood pattern" means how solidly the cells in the brood area are filled.
A solid pattern is a broad patch where nearly every cell holds brood at a similar stage, with only a few empty cells scattered through it. This usually means a good queen and healthy brood.
A spotty (or "shotgun") pattern has lots of empty cells mixed in with capped and open brood, like a shotgun blast pattern on a target.
Spotty brood isn't a diagnosis by itself. It's a symptom with several possible causes:
- A failing or poorly mated queen.
- Inbreeding. When a queen mates with closely related drones, some fertilized eggs develop abnormally. Workers remove those larvae, which leaves gaps.
- Disease. Some brood diseases cause workers to remove sick brood or leave cells with dead larvae.
- Varroa mites and the viruses they spread. These can kill or deform developing bees.
- Normal emergence. If you look just as a wave of bees is emerging, you'll see many empty cells while the queen hasn't caught up yet. The empty cells are often freshly cleaned and shiny.
- Nectar or pollen in the brood area.
So when you see a spotty pattern, look closer. Are the empty cells clean and shiny, ready for eggs? Do they have eggs in them? Is there something wrong with the larvae nearby? Are the cappings sunken or perforated?
A frame that looks spotty on one inspection and solid a week later was probably just between brood cycles. A frame that stays spotty, with odd-looking larvae, deserves a closer look and a conversation with your mentor or local apiary inspector.
Red flags in the brood
Here are the brood signs that should make you slow down and ask for help. This isn't a full disease guide.
Multiple eggs per cell or eggs on the walls
Two or more eggs in a cell, especially stuck to the walls instead of centered on the bottom, can mean laying workers. When a colony goes queenless long enough, some workers start laying unfertilized eggs. Those become drones. Worker abdomens are shorter than a queen's, so their eggs often land on the cell walls.
A brand-new queen can also sometimes put more than one egg in a cell at first, but her eggs usually sit centered on the bottom, and she settles down quickly.
Laying worker colonies are hard to fix. Ask your mentor.
Drone brood in worker cells
Bullet-shaped cappings scattered through areas that should be worker brood, especially in a patchy pattern, can mean laying workers or a drone-laying queen. That's a queen who has run out of stored sperm or was poorly mated. Normal drone brood sits in larger drone cells, usually near frame edges and bottoms.
Sunken, perforated, or greasy cappings
Healthy capped brood is slightly domed or flat, with even, dry-looking cappings. Cappings that are sunken, dark, greasy-looking, or have small holes can be signs of a brood disease, including the serious bacterial diseases. If you see this, don't move frames from that colony to others. Contact your local apiary inspector or an experienced mentor.
Discolored or melted-looking larvae
Healthy larvae are pearly white. Yellow, brown, gray, or melted-looking larvae, or larvae twisted in the cell, can point to disease. Some brood diseases also have distinctive smells. Don't diagnose this yourself from a forum photo.
Chalky white or gray "mummies"
Hard, chalky white or gray lumps in cells or on the bottom board can be chalkbrood, a fungal disease of brood. It often shows up in damp or stressed colonies.
Pupae with uncapped heads in lines ("bald brood")
Rows of capped brood where the caps are partly open, showing the pupae's heads, often in a winding line, can be caused by wax moth larvae tunneling under the cappings. Workers sometimes also uncap brood that's affected by mites, so it's worth doing a mite check if you see random uncapped pupae.
Pupae with deformed wings emerging, or mites visible on brood
If you see newly emerging bees with crumpled wings, or reddish-brown mites on bees or in opened cells, mites are likely a problem. Do a proper mite count with a method your club teaches and act on it.
Queen cells on brood frames
Queen cells are bigger, peanut-shaped cells that hang vertically. A queen develops from egg to emergence in roughly sixteen days, faster than workers or drones. Where queen cells sit on the frame gives you a hint about why the colony is raising them:
- Swarm cells are often along the bottom edges of frames, sometimes many of them.
- Supersedure cells, where the colony replaces a failing queen, are often fewer and on the face of the comb.
- Emergency cells are built from existing worker cells after a sudden queen loss, often on the face of the comb.
- Queen cups are the empty, cup-shaped bases of queen cells. Many colonies keep some around. A cup with no egg or larva in it isn't a cause for alarm.
These are tendencies, not rules.
Using brood to estimate colony strength
Experienced beekeepers often describe colony strength in "frames of brood." That means roughly how many frames, front and back, are substantially covered with brood. Comparing that count between inspections tells you whether the colony is growing.
Simple ways to track it:
- Count frames with brood on both sides.
- Note roughly how much of each side is covered (a quarter, half, most).
- Note the stages: mostly capped, mostly open, mixed.
- Record it in your log, with the date and weather.
The exact numbers don't matter as much as the trend in your own hives. Growth in spring is expected. A drop in the active season is a question to answer.
A step-by-step routine for reading a brood frame
Use this every time until it's second nature.
- Pick the right frame. Start a few frames in from the wall so you aren't fumbling with the tight first frame near brood. Many beekeepers remove an outer frame first to make room.
- Lift slowly and keep it vertical, over the box.
- Scan the whole frame first. Where's the honey, pollen, and brood? Is the layout normal?
- Look for queen cells along the bottom and on the faces.
- Find eggs. Tilt the frame so light reaches cell bottoms. Look in shiny, clean cells near young larvae.
- Look at larvae. Are they pearly white, C-shaped, in food? Are there different sizes?
- Look at capped brood. Is it solid? Domed worker cappings or bullet-shaped drone cappings? Any sunken or perforated cappings?
- Look at the bees on the frame. Watch for mites, deformed wings, or unusual behavior.
- Turn the frame and repeat on the other side.
- Put it back in the same place and same orientation, unless you're deliberately rearranging.
- Write it down before you forget.
After a few colonies you'll find you don't need to go through every step consciously. You'll notice the pattern and spot the odd things.
Common beginner mistakes
Pulling every frame looking for the queen. Long inspections chill brood, upset bees, and risk crushing the queen. If you see eggs, you know she was there in the last few days. That's usually enough.
Holding frames flat. This can make nectar drip and stress soft comb. Keep frames vertical.
Mixing up honey and brood cappings. Check position and color. Honey is usually on top and whiter. Brood is usually in the middle and tan to brown.
Panicking over a few empty cells. Some empty cells are normal, especially during emergence. Look closer before you decide the queen is failing.
Diagnosing disease from a photo online. If something looks wrong with larvae or cappings, get a qualified person to look.
Moving frames between hives without checking the brood first. Moving a frame from a sick colony can spread disease. Check before you share frames.
Forgetting to write anything down. Your memory will blur colonies together within days.
How AI can help (and where it can't)
You can photograph a frame and use an AI tool to help you organize what you're seeing, or to prompt questions for your mentor. That can be useful when you're learning. But AI image tools can misidentify eggs, cappings, and disease signs, and they can't smell the brood or look at it from different angles in real time.
The bottom line
Reading brood is the core skill of beekeeping. Eggs show that a queen was laying in the past few days. Larvae show that laying has been steady and that brood is being fed. Capped brood shows what the colony was doing over a week ago. A solid pattern of all three is the healthy baseline. Gaps, odd cappings, discolored larvae, multiple eggs per cell, and queen cells are your cues to slow down, look closer, and ask for help.
Hold the frame vertically, over the box, with the light behind you. Look straight into the cells. Take your time on one frame instead of rushing through ten. Write down what you see. After a season of doing this, the frames will start telling you what's going on before you even reach for your notebook.
We are bees. We save bees. Most of that work happens one frame at a time.