Queen Excluders: Metal vs Plastic, and When to Skip One

Skip it unless you’re making comb honey, running singles, or grafting queens. On a strong nectar flow the bees push the brood nest down on their own, and a grid seated under a super of undrawn foundation is the most common reason a super never gets used.

Quick Answer: For most hives the honest answer is to skip the excluder until a specific job calls for one. When you do need one, the Mann Lake Wood-Bound Metal Queen Excluder at $32.99 is the pick most hives should end up with. The Ambrose Bee Supply Plastic Queen Excluder at $16.88 is the cheapest way to find out whether your bees even care.

1. A worker bee is about 0.14 to 0.15 inches across. A queen is 0.16 to 0.19 inches. The grid slot is cut to land in that gap, which is why excluders get specified in fractions of an inch rather than in bee sizes.
2. A queen excluder is not a honey excluder. A honey excluder is a one-way valve that lets bees in and keeps bees out. A queen excluder is a flat grid that only blocks the queen. Different parts, different jobs, different prices.
3. Six excluders are reviewed below, priced from $15.99 to $36.79. Three are metal, one of those wood-bound, and three are plastic.
4. The most-reported failure isn’t a bad grid. It’s installing one a week or two too early, under a super of foundation with nothing above it yet.

What a Queen Excluder Actually Does

A queen excluder is a flat panel with slots cut through it. The slot width is set by one measurement: a worker bee’s thorax is roughly 0.14 to 0.15 inches wide, and a queen’s thorax is roughly 0.16 to 0.19 inches. A grid whose slots sit inside that gap passes the workers and stops the queen. There’s no moving part, no spring, no valve — it’s a piece of stamped sheet metal or molded plastic with holes in it.

That measurement is the entire design. It also explains the failure mode people notice immediately: a queen is a big animal with a wide thorax. If a slot is cut even slightly too wide she can get it into the opening. Most grids sold today are stamped with smooth, rounded openings. That’s precisely because of the sharp-edged stamped metal of the 1930s, which is where a lot of the bad stories about excluders come from.

Two more things the part does not do, both of which trip people up:

• It doesn’t stop the queen from being in the super. It stops her from passing through the grid. A queen that is already above the grid when you seat it stays up there. This is the most common way people end up with a queenless-looking mess, and it’s covered in how to find the queen.
• It doesn’t make honey brood-free on its own. A grid narrows the odds dramatically. A wandering second queen, or brood already in the frames before you seated the grid, still ends up in your harvest.

The name confusion is worth clearing up before anything else, because the two parts get sold in the same aisle. A honey excluder is a plastic one-way valve that goes in a bottom board or between boxes. Bees can get in, bees can’t get back out, so a swarm is locked in with the queen and starts a new colony inside your equipment. It is cheap, usually a few dollars, and it has nothing to do with honey. A queen excluder is the grid, and it is what this article is about.

Do Queen Excluders Work? The Short Answer

Mechanically, yes. A correctly sized grid does exactly one thing and does it reliably. That’s why nearly every beekeeping supplier sells one, and why all nine of the editorial guides we read for this piece cover the honey-super case. There’s no dispute about whether the part works.

The dispute is whether it’s worth having in your stack, and that depends on your honey crop and your colony population rather than on the hardware. Experienced beekeepers report the same thing in different words: during a strong flow the bees backfill the brood nest faster than a beekeeper can add supers. Eggs in the honey supers stop being a problem by the time harvest rolls around.

So the question is not does a queen excluder work. It’s whether you have a job for one.

When to Skip One

Skip it in three situations, and the reasons are worth spelling out because each one costs a hive real time.

You have a handful of hives and no comb-honey goal. A grid doesn’t make honey taste better or increase the yield. It changes where the brood sits, which is only worth money to you if you’re selling capped comb or you’re managing brood placement deliberately. Our read: an excluder makes harvesting easier because you know where the queen isn’t. That’s genuinely nice, but it’s convenience rather than production.

You’re putting it under undrawn foundation. This is the big one, and it’s the reason a lot of hives own a grid that lives in a drawer. Bees are slow to move up through a grid into a super that has nothing but foundation in it. Experienced beekeepers report the same failure from two directions. They’re more reluctant to move up for a grid than for bare foundation. You need a large, young population — right on the edge of swarming is ideal — plus a strong flow to get good results. Put one under fresh foundation in a colony that isn’t boiling over and you may wait weeks for nothing.

Your colony isn’t big enough to push bees up. A grid is a barrier for a colony that has the bees to spare, and a wall for one that doesn’t. Same part, different result, entirely about population and flow strength.

There’s a fourth, quieter case: installing it during a robbing event or right after a disruption, when the bees are already agitated. Add the grid to an already-unhappy colony and you’re solving two problems at once, badly.

Metal vs Plastic vs Wood-Bound: What Actually Changes

There are three builds on the shelf and almost every guide picks the one its author sells. Dadant sells metal. Mann Lake sells wood-bound metal. The plastic grids on Amazon are sold by sellers who tell you plastic is fine. The honest comparison has to come from somewhere other than a storefront. It can: a large set of owner comments on the plastic excluders, and years of field reports from beekeepers who have used both.

Metal. Stamped stainless or galvanized sheet. It doesn’t sag, it doesn’t flex in humid weather, and it won’t snap if you drop it. Its one real drawback is thermal. A bare metal panel sitting between a brood chamber and a super is a cold surface, and metal conducts that chill straight through to whatever’s on the other side. In a marginal climate that’s a genuine argument against bare metal, and it’s the reason the wood-bound version exists.

Wood-bound metal. Same steel grid, framed in wood. The wood breaks the thermal bridge, the panel sits flat without rocking, and it looks like part of the hive instead of a machine part. This is the build most of the equipment trade has quietly converged on, and it’s the default recommendation here.

Plastic. Molded in one piece, usually with a wire or plastic frame around it, and roughly half the price of the wood-bound build. Two caveats come up repeatedly in owner comments on the plastic units, and they’re worth taking seriously because they’re specific rather than vague. One owner who had used nothing but metal for years wrote that the plastic fits fine and feels thick, but that they stay careful removing it because it might break. Another wrote that the slot size is good and then added the line that matters: as with all plastic queen excluders they have used, they will sag. Sag is the failure that matters, because a sagging grid no longer holds its slot width and can start passing a queen.

The bees’ own preference. The other claim — that bees are reluctant to cross plastic — shows up in two independent places, which makes it harder to dismiss. Experienced beekeepers report they’re more reluctant to move up for a plastic grid than for wax foundation. One keeper who uses excluders says flatly that they won’t use plastic because the bees hate them and won’t cross. The same keeper doesn’t see that with a wire version. The same people also report that delaying installation by a week or two fixes a super that isn’t drawing. Material and timing are tangled together and hard to separate with confidence.

Our read: the plastic complaint is real, but it’s about the cheap end of the plastic range. The timing complaint gets blamed on the material because plastic is what most first-time buyers put in the box.

Sizing: 8-Frame, 10-Frame, and Nucs

Measure the box before you buy anything. An excluder is a flat panel that has to rest on the frame tops of a specific box size. Gear does not interchange between 8-frame and 10-frame Langstroth — the 8-frame box is narrower, so a 10-frame grid either overhangs the walls or rattles. For reference, the standard Langstroth dimensions are in our Langstroth hive guide.

That’s the whole sizing problem for standard boxes. The thinner part is coverage: most of the guides we read for this piece are written for 10-frame equipment, and a few mention 8-frame only in passing. If you run 8-frame boxes you’re used to doing your own research on everything else, and an excluder shouldn’t be different.

Nucleus colonies are the awkward case. A nuc box is smaller than both, and the common workaround is to cut a section out of a full-size grid. One owner did exactly that, using a three-inch by nine-inch section to reduce the entrance on a cell builder built for grafting. That trick is worth knowing for cell builders, but it isn’t a substitute for a correctly sized grid.

How These Six Were Picked

BeeGuide did not buy any of these and put them in a hive. Nothing here is a field test. What we did was read the manufacturer listings, pull the owner comments that were extractable, and rank on what you can check before the money changes hands. That means build material, whether the frame is wood or bare metal, pack size, cost per grid, box size, and how much the seller actually tells you.

Two things decide a lot here. Price per grid matters more than sticker price once you’re running more than one hive, which is why two of these are packs. And owner feedback is uneven. The plastic unit below has a lot of comment history, including a genuine warning. The wood-bound metal unit has a thinner pool of readable comments. We’re not going to paper over that by borrowing enthusiasm we didn’t find.

#1 — Mann Lake Wood-Bound Metal Queen Excluder, 10-Frame — Editor’s Choice ($32.99)

This is the one most hives should end up owning. It’s a stamped metal grid set into a wood frame, sized for 10-frame boxes, and it costs $32.99. That’s $17.00 more than the cheapest unit in this roundup and $16.11 more than the plastic pick below.

The wood frame is the part worth paying for. Metal conducts cold straight through, and a bare panel between a brood chamber and a super is a cold shelf in the middle of a hive. The wood breaks that path, and it also means the panel sits flat on the frame tops instead of rocking on a lip. If you live somewhere with a real winter and you intend to leave the grid in place, that’s the deciding feature.

The one owner comment we could extract at readable length describes the slot geometry, which is the thing that actually matters. It excludes the queen, but the bars are wide enough that they don’t wipe pollen off the workers passing through. A grid with slots packed tight to the minimum spec will strip pollen off every forager that crosses it. That shows up as a sudden drop in pollen coming in.

What we like:

• Wood frame removes the cold-bridge problem that bare metal has
• Rigid enough that slot width won’t change over a season, which is the failure that matters most
• The slot width leaves pollen on the bees instead of stripping it off

What could be better:

• $32.99 is real money for a hive tool, and it’s single-unit — you pay full price for every hive
• Owner comment history we could read was thin, so most of the case for it rests on the build rather than on reported experience
• 10-frame only, so an 8-frame hive needs a different unit

“I like the wide slots. The queen excluder bars exclude the queen but are wide enough so not to wipe pollen from the worker bees passing thru.” — owner comment on the product listing

Best for: a hive that’s staying in your yard for years, in a climate where the cold bridge is a real concern, and where you only need one grid.

#2 — Ambrose Bee Supply Plastic Queen Excluder, 10-Frame — Best Value ($16.88)

Half the price of the editor’s pick and the unit with the most readable owner history in the set, which makes it the most useful thing to learn on. It’s a molded plastic grid for 10-frame boxes at $16.88, and it’s sold as a single unit.

The owner comments here are more interesting than the marketing, and two are worth reading before you buy. One owner who has used metal excluders exclusively says this one fits fine, feels thick, and didn’t disappoint. They stay careful removing it because it might break. Another says the individual slot openings are the right size, then adds the sentence that matters: as with all plastic queen excluders they’ve used, they will sag. A third confirms the job itself is done, noting the slots let workers through to make honey while staying too narrow for a queen to get her egg-laying bulk through.

The sag comment is the one to sit with. A plastic grid that droops in summer heat changes its slot geometry, and a changed slot geometry is the difference between blocking a queen and not.

What we like:

• $16.88 is a low enough price to find out whether your colony will even use a grid
• The most detailed owner commentary in the roundup, including the honest failure reports
• Light enough to lift one-handed without shifting frames

What could be better:

• Owners report sag over time and breakage during removal — both are failure modes metal doesn’t have
• Bees are reported as more reluctant to cross plastic than metal
• Single unit, so multi-hive yards pay full price repeatedly

“I’ve used nothing but metal excluders before this one. Fits fine and is thick. I’m still careful when removing it since it might break.” — owner comment on the product listing

Best for: your first excluder, one hive, and a climate that isn’t cooking the plastic every July.

#3 — NUOMIC Galvanized Metal Queen Excluder, 8-Frame 3-Pack — Best for 8-Frame Hives ($33.99)

If your boxes are 8-frame, this is the pick. It’s a galvanized metal grid sized for 8-frame boxes and it comes three to a box, which works out to $11.33 per grid. It sits at the top of the roundup with the wood-bound unit, and most of that cost is the pack.

A note on what this is: the same manufacturer also sells this grid in a 10-frame size. It’s the same panel in a different footprint rather than a different product. This review covers the 8-frame version only, and the owner feedback for the two sizes is shared, so treat the read here as applying to both.

The reason it earns the slot is coverage. Almost everything written about queen excluders assumes 10-frame equipment. If you’re running 8-frame boxes you already know the drill for everything else, and having a metal grid that actually fits your boxes ends that particular hunt.

What we like:

• The only purpose-built 8-frame metal option in this roundup
• Three grids in one order, so a small yard is covered at $11.33 each
• Galvanized metal, so no sag and no cold-plate concern in a single piece

What could be better:

• $33.99 up front for a three-pack you may not need if you run one hive
• Bare metal, with the thermal drawback that comes with it
• 8-frame only — it will not sit correctly on a 10-frame box

Best for: 8-frame hives, especially if you have more than one.

#4 — Vizo-Lu Metal Queen Excluder, 10-Frame 4-Pack — Best for Multiple Hives ($36.79)

The most expensive unit here and the one that makes the most sense once you have four hives or more. It’s a heavy-duty metal grid for 10-frame boxes, four to a box, at $36.79 — that’s $9.20 per grid.

This is a straightforward logistics pick. If you’re running four hives and you know you want grids, buying them one at a time costs four separate orders and four separate shipping charges for the same hardware. The wood-bound unit is the better single purchase, but there’s no wood-bound four-pack in this roundup. There’s also no version of this grid with a wood frame. So the comparison at four hives comes down to this versus assembling a set of singles.

What we like:

• $9.20 per grid is cheaper per unit than any metal option in the roundup
• One order covers a four-hive yard
• Heavy-duty metal build in a size that stays rigid

What could be better:

• Top of the price band at $36.79, for hardware that’s not better than the $32.99 wood-bound unit
• Bare metal again, so you’re buying the thermal drawback too
• If you only have two hives, you have two spare grids you’ll never seat

Best for: four or more hives where you’ve already decided you want grids.

#5 — Marsui Plastic Queen Excluder, 10-Frame 6-Pack — Best per Grid ($15.99)

The cheapest way to get your hands on a grid, and the arithmetic behind it is the whole argument. Six plastic grids for 10-frame boxes at $15.99 works out to $2.67 each, which is less than a fifth of the wood-bound metal unit.

That ratio changes what a grid is for. At $32.99 a grid is a purchase you think about. At $2.67 each it’s a consumable you keep in the truck — one for the hive, one for the cell builder, one for the nuc you’re requeening. There’s also one you don’t feel bad about cutting a section out of when you need to narrow an entrance. For splitting work, where an excluder goes in and comes back out across a season, having six is a different proposition from having one.

The plastic caveats from the value pick above apply unchanged. Sag over time, care during removal, and bees reported as slower to cross plastic. What you gain is quantity, not durability.

What we like:

• $2.67 per grid is the lowest unit cost in the roundup by a wide margin
• Six in one box covers a season of splitting and cell builder work
• The right grid to cut up for entrance reduction on a nuc or cell builder

What could be better:

• Plastic sags and can crack on removal, same as any plastic unit
• Six grids is a lot of plastic to store when you run two hives
• The reported reluctance of bees to cross plastic applies here too

Best for: splitting, grafting, and anyone who wants spares instead of a single precious grid.

#6 — BeeQuestify Plastic Queen Excluder, 10-Frame 3-Pack — The Middle Plastic Option ($19.99)

Three plastic grids for 10-frame boxes at $19.99, or $6.66 each. It’s the middle of the plastic range on price. It exists because the plastic category has a real gap in it: one single unit is too few, and six is more plastic than a two-hive yard wants.

If you’re running two or three hives and want a spare, this is the shape that fits. The build is a molded plastic grid in a framed panel for 10-frame boxes, same as the other plastic units here. Everything in the plastic section of this guide applies to it directly — the sag reports, the care during removal, and whether your bees will cross it quickly.

What we like:

• Three units is the pack size that matches a small yard
• Keeps a spare on the shelf without a six-pack’s worth of storage
• Framed panel, so it seats flat on the frame tops

What could be better:

• Plastic sag and breakage reports apply as they do to every plastic unit
• You give up the wood frame that solves the cold bridge
• Owner feedback on this specific listing was thinner than on the single plastic unit above

Best for: two or three hives that want a spare in the truck.

Installing It Without Crushing Bees

The install is quick and it’s the step people rush. That’s how you end up with a handful of crushed bees under a grid and an agitated colony that won’t move up for a week.

Work on a warm, still day with the bees flying. Smoke the hive, lift the super off, and set it on its lid. Get the bees off the top bars before the grid goes anywhere near them. A bee brush at $9.99 does this better than shaking frames, and the ones you’d brush off are foragers you’ll want calm and unharmed. Our bee brush roundup covers the bristle options.

Lift the grid with two hands on the frame edges, or slide a frame grip at $7.99 under it and lift from one side. Never pull from the middle — the grid is wider than the box, it will tip, and the far edge will land on bees. Our beekeeping gloves guide covers picking a pair that don’t wreck your grip on frame tops.

The technique that avoids most of the disruption is the backflip. Brace the far edge of the grid on the far wall of the brood box, lift the near edge, and roll it over in one motion. It lands flat rather than being lowered and dragged into place. It sounds fussy written down. It’s quick, and it means you never slide a metal panel across comb.

Before the grid goes in, check what’s above it. If there are frames of brood in the super, those come down first. A grid stops the queen from crossing; it does nothing about a queen that’s already up there.

The First Three Weeks: Coaxing the Bees Up

Most “the excluder doesn’t work” reports are actually “I installed it correctly and the bees still didn’t move up.” Different problems, different fixes.

Put a frame of open brood on top. This is the trick that comes up most often. Take a frame with open larvae from the brood box, move it up above the grid, and leave it there. The nurse bees have to follow the larvae to feed them, so the population above the grid goes up within a couple of days. Once it’s up, the rest of the bees follow. Once that brood is capped, move the frame back down and the bees keep using the super. The comb won’t be snow white, and if you’re not selling comb honey that doesn’t matter.

Open an upper entrance. Foragers will use it instead of crawling up through the brood nest and the grid, which takes a layer of traffic off the barrier. There’s a second reason that’s just as important. Drones have to be able to get out of the hive to fly and eliminate body waste, and if they’re sealed under a grid they die in there. Nobody warns you about this, and it’s the one genuine harm an excluder can do.

Delay the install by a week or two. If the bees aren’t moving up, take the grid out and let them work the super bare for a while, then seat it. Partly filled frames pulled up above the grid also help — the bees are already committed to those frames and they keep filling them above the line.

Give them a reason to go up. A honey dome forming above the brood nest is the signal bees are looking for, and once it exists a grid is largely redundant. Foragers will find honey above the nest because that’s where the bees are putting it.

Cut a bigger hole. One keeper who won’t use plastic reports giving the workers a three-quarter inch hole straight into the honey super made a difference. It’s an unorthodox fix, and it only works if the hole is above the queen’s reach, but it’s cheap to test.

When to Take It Off

A lot of hives leave the grid in year-round, and the reason given is brood-free comb. Wax moth is more attracted to comb that has had brood in it. So a keeper running singles wants honey frames that have never been nested, and a year-round grid is the simplest way to get that. Fine. That’s a preference, and it’s a defensible one.

The claim that excluders shorten the lifespan of the bees is a different story, and it doesn’t survive contact with the hardware. The story traces back to sharp stamped metal of the 1930s, where a bee could get caught and damaged in a slot. Grids sold today are stamped or molded with smooth openings. A keeper running ten to twenty hives for over a decade who has used excluders year-round describes the claim as nonsense rather than a trade-off.

The practical reason to pull a grid is simpler. If the bees are backfilling the brood nest and the honey super is clean anyway, you’re carrying a panel and a step for nothing. Leaving it in costs a little inspection time and a cold surface in winter. Neither is an emergency.

Troubleshooting: Five Real Failures

1. The bees won’t cross the grid. The most common complaint and the one with the most solutions. In order of how often they’re reported to work:

• Put a frame of open brood above the grid and leave it until it’s capped.
• Open an upper entrance.
• Take the grid out for a week or two and let them work the super bare.
• Confirm the colony is genuinely large and young rather than small and struggling.
• Consider that plastic is a harder surface to cross than wax foundation.

If the super is full of fresh foundation with nothing drawn, the answer is usually timing, not hardware.

2. The queen is trapped above the grid, or won’t go through it. A grid does not stop a queen from being in the super — it stops her crossing. If she was up there when you seated the grid, she’s still up there. She can end up laying in a small patch with no room for the colony to expand. Confirm she’s alive and find out where she is before you do anything else. Finding the queen covers the excluder method and the frame-by-frame search, and marking a queen makes her much easier to spot next time.

3. The super never gets drawn. Almost always installed too early. An empty super under a grid with undrawn foundation is the worst case, and no product fixes it. Give the bees a week or two on the super without the grid, or raise a frame of open brood into it.

4. Drones are dying under the grid. Drones can’t pass through a queen excluder. If there’s no upper entrance, they’re sealed in the brood chamber and they die there. Open an upper entrance — that resolves it immediately. A pile of dead drones under a grid with no upper entrance is a diagnostic, not a mystery.

5. The colony looks queenless. The worst outcome, and worth naming plainly. A colony that was queenless to begin with, or that lost its queen during the swap, will not recover because you added a grid. Check for eggs and worker larvae before blaming the excluder; queenless colony covers the diagnosis.

Mite counts are worth keeping on your own schedule — a grid changes where the bees are, not what parasites they’re carrying. Our varroa treatment guide is the place for treatment timing.

Which One Should You Buy

If you’re still undecided, don’t buy anything yet. Run a season with the super on and no grid and see whether you actually end up with brood in your honey frames. Plenty of hives never do.

When the answer is yes, match the build to the job. One hive and uncertain: the plastic value pick at $16.88, the cheapest way to find out. Comb honey, or a hive that stays put through winter: the wood-bound metal unit at $32.99. A four-hive yard: the metal four-pack at $36.79, at $9.20 a grid. Eight-frame boxes: the 8-frame three-pack at $33.99, the only one here that fits. Splitting and grafting, where grids go in and out all season: the plastic six-pack at $15.99, at $2.67 each.

A wire mesh frame and a pair of pliers is the other option, and experienced keepers do use them. But a hand-cut grid is exactly where slot width goes wrong, and the whole design lives or dies on that measurement.

Related reading:

• What to wear for hive inspections — protective kit for the install step
• The beekeeping starter kit checklist — where an excluder fits in a first-season kit
• Frame grip and hive tool roundup — lifting the grid without a shifted frame
• Langstroth box dimensions — the measurements that decide 8-frame or 10-frame
• Plastic hive guide — the same sag-and-heat problem, in your boxes
• Splitting a hive — the other job that calls for a grid
• Spring management and the beekeeping calendar — when in the season to install
• How to harvest honey — the payoff the excluder is meant to protect
• Getting started with beekeeping — including the 3-3-3 rule for moving a hive

More from BeeGuide: bee equipment guides and the home page.