5 Frame Nuc Box: What It Is, What It’s For and How to Choose One
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A 5 frame nuc box is a small, narrow hive that holds five standard Langstroth frames instead of the usual eight or ten. “Nuc” is short for nucleus colony: a small but complete colony with a queen, brood, bees and stores. Beekeepers use nuc boxes to make splits, catch swarms, raise queens, keep spare colonies over winter and carry colonies from one place to another. Because it takes the same frames as a full hive, everything in a nuc moves straight into a full-size box when the colony outgrows it.
This guide covers what a nuc box is used for, deep versus medium, wood versus polystyrene versus cardboard, what a complete nuc should include, and how to move a nuc into a full hive.
What a 5 frame nuc box is
Picture a 10-frame Langstroth hive cut in half lengthwise. The box is the same length and depth as a full hive body, so standard frames hang in it on the same rabbets, but it is only about half as wide. A complete nuc has the same parts as a full hive in a smaller size: a bottom board with an entrance, the box, an inner cover and a top cover.
Five frames is a useful size. It is big enough for a colony to build up, store food and, in many climates, survive a winter. It is small enough that a few thousand bees can keep the brood warm and guard the entrance without being overwhelmed by space.
What beekeepers use nuc boxes for
Making splits
The most common use. Take two or three frames of brood and bees, plus a frame of honey and pollen, from a strong colony, put them in a nuc with a new queen or a queen cell, and you have a new colony. Splitting also relieves congestion in the parent hive, which helps prevent swarming. Our guide to splitting a hive has the full method.
Catching swarms
A nuc box is light enough to carry to a swarm, and a typical swarm fits it well. It also works as a bait hive: scout bees looking for a new home prefer a cavity of roughly 40 liters, a bit larger than a 5-frame deep nuc, but nuc boxes still catch plenty of swarms, especially with old comb and a lure inside. See how to attract and catch a swarm.
Queen rearing and mating
A queen cell or a virgin queen goes into a nuc with a couple of frames of bees, the queen mates, and you can check her laying pattern before using her to requeen a full colony. Small nucs use fewer bees than a full hive for the same job. Our introduction to queen rearing explains the process.
Overwintering resource colonies
Many beekeepers go into winter with one or two spare nucs. If a full colony loses its queen or dies over winter, a nuc with a laying queen can replace it in spring, or supply brood to boost a weak hive. Nucs can overwinter well, especially when stacked two high or placed on top of a strong colony for warmth. Our guide to resource hives, queen castles and nucs goes deeper.
Buying and moving bees
Buying a nuc is one of the best ways to start beekeeping, because you get a laying queen and drawn comb with brood already in it. Nucs are usually sold in a 5-frame box, often cardboard, which you then transfer into your own equipment. A wooden nuc box is also useful for moving a small colony to a new site or out-apiary. See obtaining and installing a nucleus colony.
Deep or medium nuc box?
Match the nuc to the frame size in your brood boxes. The whole point of a nuc is that its frames swap straight into your full hives.
| Deep nuc | Medium nuc | |
|---|---|---|
| Frame depth | About 9 1/8 inches (fits a 9 5/8-inch box) | About 6 1/4 inches (fits a 6 5/8-inch box) |
| Brood area per frame | Larger; more brood per frame | Smaller; about two-thirds of a deep |
| Weight when full | Heavier | Lighter to lift |
| Availability | Most bought nucs come on deep frames | Less common; ask your supplier |
| Best for | Beekeepers with deep brood boxes | Beekeepers running all-medium equipment |
If you run deep brood boxes, which most beginners do, buy deep nucs. If you have switched to all-medium boxes to save your back, a medium nuc keeps everything interchangeable.
Wood vs polystyrene vs cardboard
| Material | Strengths | Drawbacks | Best for |
|---|---|---|---|
| Wood (pine or cedar) | Durable, lasts for years, can be painted or waxed, easy to repair | Heavier; less insulating than poly | All-round use, splits, swarm boxes |
| Polystyrene | Very well insulated; light | Easily dented by hive tools; can be chewed by pests | Overwintering in cold climates, queen mating |
| Cardboard (waxed) | Cheap and light | Lasts weeks to a season, not years; not for wet weather or winter | Transporting purchased nucs, emergency swarm catching |
Cedar is popular because it is naturally rot-resistant and light for a wood. A beeswax coating helps protect the outside without paint. If you are handy, you can also build a homemade nuc box.
What a complete nuc box should include
- Bottom board with an entrance. Solid bottoms are common on nucs; a removable one makes cleaning easier.
- Entrance reducer. Essential. A small colony needs a small entrance to fend off robbers.
- Inner cover, ideally with a hole or vents for ventilation and feeding.
- Top cover, preferably metal-clad to shed rain.
- Five frames with foundation, in the depth you use.
You will also want a way to feed. A small internal frame feeder takes the place of one frame, or you can put a jar feeder over the inner cover hole.
Our 5 frame nuc box picks
1. Complete 5-Frame Nuc Box Kit with Metal Roof (best complete kit)
This kit arrives with everything a nuc needs: a wax-coated cedar box, pine frames with beeswaxed plastic foundation, a metal top cover, an inner cover with vents, a removable bottom board and an entrance reducer. The box measures 19.9 x 9 x 9.5 inches. The removable bottom makes cleaning easy between uses, and having the reducer included means a new split or swarm can be protected from robbers on day one.
- Good: Complete kit with frames, foundation, reducer and vented inner cover; removable bottom board
- Watch for: Plastic foundation, so check it suits you if you prefer pure wax
2. BeeCastle 5-Frame Nuc Box, Beeswax-Coated Cedar (best build quality)
BeeCastle soaks the cedar of this nuc fully in beeswax, which protects the wood without paint, and joins the box with dovetail corners. It comes with five cedar frames and waxed foundation, a metal top cover, an inner cover, a solid bottom board and an entrance reducer, and the wood is FSC certified. It is a good choice for a nuc you plan to use for years, for splits in spring and resource colonies in winter.
- Good: Fully beeswax-soaked cedar with dovetail joints; complete with frames, covers and reducer; FSC wood
- Watch for: Solid bottom rather than screened, so plan ventilation through the inner cover
3. Beeswax-Dipped Cedar 5-Frame Deep Nuc Box (best simple alternative)
A straightforward cedar nuc box, dipped in beeswax and supplied complete with five deep frames and foundation. Deep frames are what most beekeepers use in their brood boxes and what most bought nucs come on, so the frames from this box will move straight into a standard deep hive body when the colony is ready to go up. A sensible second or third nuc for splits and swarm catching.
- Good: Cedar, beeswax-dipped; comes with five deep frames and foundation
- Watch for: The listing gives less detail on covers and bottom board than the other two, so check what is included
How to move a nuc into a full hive
A nuc is ready to move up when the bees cover all five frames and the queen is running out of room to lay. In spring and early summer that can happen within a few weeks.
- Set up the full hive in the nuc’s spot. Move the nuc aside and put the full hive exactly where it stood, so returning foragers find the new entrance.
- Move the frames in the same order. Lift each frame out of the nuc and place it in the center of the new box, keeping the frames in their original order and facing the same way. This keeps the brood nest intact.
- Check for the queen as you go, and take care not to roll her between frames.
- Fill the gaps. Add new frames on either side to fill the box. Leave no empty space, or the bees will build wild comb.
- Shake in the stragglers. Tap the last bees from the nuc into the new hive, or stand the empty nuc at the entrance so they walk in.
- Reduce the entrance and feed. The colony now has more space to defend. Feed sugar syrup if there is no strong nectar flow, to help them draw out the new foundation.
Check again in a week to make sure the queen is laying and the bees are drawing comb. If you are still gathering equipment for that full hive, our guide to beehive starter kits compares complete setups.
Frequently asked questions
How long can bees stay in a 5 frame nuc box?
Indefinitely, if you manage them. A nuc can stay small all season if you keep removing frames of brood to strengthen other hives. Left alone in spring, a thriving nuc will fill the box within weeks and may swarm if not given more room.
Can a 5 frame nuc survive winter?
Yes, if it is strong and well stocked going into fall. Many beekeepers stack a second nuc box on top for extra stores, use insulated poly nucs, or set nucs on top of a strong hive for warmth. A weak nuc in a cold climate is better combined with another colony.
What is the difference between a nuc and a package of bees?
A package is loose bees and a caged queen with no comb. A nuc is an established small colony on frames, with a laying queen, brood and stores. Nucs usually build up faster because they have a head start.
Will 5 frame nuc frames fit my 10 frame hive?
Yes, as long as the depth matches. Deep nuc frames fit deep boxes and medium nuc frames fit medium boxes, in both 8- and 10-frame Langstroth hives.
When should I move a nuc into a full hive?
When bees cover all five frames, there is brood on most of them, and the queen is short of space. Do not wait until the box is packed and queen cells appear, as that is a sign the colony is preparing to swarm.
A good nuc box earns its keep many times over, from your first split to your spare winter queens. It is often the second piece of equipment a new beekeeper buys, and rarely one they regret.
