Predator Proof Chicken Coop: Mesh, Apron, Latches

A predator proof chicken coop is not one product or one trick. It is a set of details that each close one way in: the mesh, how that mesh is fixed, the ground at the base of the run, the roof over it, the doors and their latches, and the floor. NC State Extension puts the stakes plainly in its garden chicken guide: predation is the most common cause of death in small poultry flocks. This guide goes through each detail, says what the extension services ask for and where they disagree, and gives the exact values our designer uses, with a worked example of a 4x8 coop for six hens and an 8x8 run.

What a predator proof chicken coop has to stop

It helps to sort predators by how they get in, because each method has its own fix. UNH Extension lists foxes, coyotes and bobcats as mostly night hunters that carry birds away, raccoons and weasels as serious overnight threats, larger hawks as daytime attackers from above and great horned owls as night raiders. Dogs, cats, skunks, opossums and, now and then, black bears complete its list.

Diggers at the base of the run

Anything that can dig will try the line where the wall meets the soil. A wall that stops at ground level leaves that line open, which is why every extension source in the apron table below adds some form of buried or surface wire along the run perimeter. The apron section below covers the numbers.

Reachers and squeezers at the mesh

UNH notes that raccoons often pull a chicken’s head or legs through a wire fence, and asks for mesh openings smaller than 1 in so predators cannot reach through. The Cooperative Extension’s predator page says least weasels can squeeze through holes as small as 1/4 in, which is why it expects them to get through chicken wire. That makes the opening size the first number to get right on the mesh.

Climbers and openers at the doors

A raccoon that cannot get through the wall will work at the doors, the lids and the hinges. Every door is an opening that has to be as strong as the wall around it, and its latch has to hold against an animal that can grip and pull.

Flyers over the run

Walls and an apron do nothing against a hawk by day or an owl at night. Penn State ties the covered run directly to hawks and owls, and Virginia Tech gives the same advice to cover the top of outside runs.

Hardware cloth on every opening, not chicken wire

Our default is 1/2 in galvanized hardware cloth, 19 gauge, on every coop opening, under the floor frame and over the full height of the run walls. That choice comes straight from the sources on the mesh itself; the gauge is the one part that is ours.

Why chicken wire fails our checks

Utah State Extension is blunt: chicken wire “is not a barrier to predators”, most predators can tear through it and rats can bite through the thin wire, so it should only keep chickens in. UC Davis Cooperative Extension says nothing less strong than hardware cloth should go on the coop itself. In the designer, picking chicken wire turns two checks red at once, the mesh on the openings and the run walls, with the note that it keeps hens in but does not keep predators out. A deeper comparison of the two materials will get its own guide; here the short answer is that chicken wire is a fence for chickens, not against predators.

1/2 in or 1/4 in: the sources disagree

The extension services do not agree on the opening size, so here is who says what:

We use 1/2 in as the default because it sits inside Utah State’s range, matches Maryland and the UC Davis maximum, and is well under UNH’s 1 in. If weasels or mice are your problem, the designer offers 1/4 in, which follows Colorado State and the Cooperative Extension’s weasel figure.

19 gauge is our choice, not a source

No extension source we read gives a wire gauge. Utah State asks for “heavy-gauge” mesh under the subfloor and stops there. Our shopping list names 19 gauge for 1/2 in cloth and 23 gauge for 1/4 in because those are the gauges stores sell in each opening size. Lower gauge numbers mean thicker wire, so if you find a heavier 1/2 in cloth, it only helps.

Fixing the mesh so it cannot be pushed in or peeled off

On a predator proof chicken run, good mesh fixed badly is still a weak wall. The fixing decides whether a determined animal can push a panel in or lift an edge.

Mesh on the outside of the posts

NC State says to secure the run wire to the outside of the upright posts, because wire secured on the inside “may be pushed in by a persistent predator”. With the mesh outside, an animal pushing on the wall pushes it against the post instead of away from it. Our run puts every band of mesh on the outside face of the 4x4 posts and rails.

Washer-head screws every 6 in, with a 1 in lap

Our default laps the hardware cloth 1 in onto the framing on every side and fixes it with 1 in washer-head screws every 6 in of edge. On the worked example that adds up to about 731 screws, which the shopping list rounds to 8 boxes of 100. The point of the washer head is that it clamps the wires against the wood rather than passing through an opening.

Bands that land on a rail

Hardware cloth comes in rolls 24, 36 and 48 in wide, so a tall run wall is built from bands stacked one above the other. We run a 48 in band from the ground up and a 36 in band above it, and set a 2x4 rail on edge at the joint so both band edges land on wood and get screwed. A seam that floats between posts is a seam that can be peeled open.

The anti-dig apron: on the surface or buried

The apron is the wire that stops a digger at the base of the wall. The sources agree that you need one and disagree on how deep it goes.

What the extension services say

NC State’s surface option matters because it is the only one here that needs no trench: the wire bends outward where the wall meets the ground and extends at least 12 in across the soil, away from the coop, held down so predators cannot push under the edge.

Our surface apron: 12 in up, 12 in out

Our default apron is a 24 in strip of hardware cloth screwed to the pressure-treated bottom rail. On the surface, 12 in of it runs up the wall and 12 in lies flat on the ground, pinned with a 6 in landscape staple every 12 in along the outer edge. Around the 8x8 run in the example that is 36 ft of apron and 40 staples.

Our buried option: 6 in up, 12 in down, 6 in out

The same 24 in strip can go underground instead: 6 in up the wall, 12 in down a trench and the last 6 in turned outward. The 12 in depth and the 6 in turn follow Penn State and Virginia Tech. On the same run that is 34 ft of strip and no staples, but a 12 in trench all the way around. Choose it where the apron would sit under a path or a mower, or where you want nothing showing.

Which one to choose

Both pass the designer’s apron check, because both have a primary source behind them. The surface apron is faster and easier to inspect; the buried one is out of sight and out of the way of tools. The designer has no setting without an apron.

Doors, latches and a pop door that bolts at night

Every door is a gap in the wall that you open on purpose. The rule for doors is simple: when closed, they are as strong as the wall, and their latches need more than one motion.

The pop door bolts shut at night

Oregon State asks for a coop that closes the flock inside at night, and UNH calls keeping chickens indoors at night the most important and effective way of protecting birds that range by day. Our pop door is 10 x 13 in with its sill 6 in above the coop floor, a size that comes from a coop builder’s guide, The Featherbrain, since no extension source gives one. It slides in guides, lifts from outside with a screw eye and 10 ft of cord, and locks closed with a 3 in barrel bolt once the hens are in for the night.

Two-step latches on every door and lid

A two-step latch needs two separate movements to open, which is why it is sold as raccoon-resistant; a hook and eye needs one. The worked example has six of them: two on the nest box lid, two on the clean-out doors and two on the run door, one high and one low, so a tall door is held at both ends rather than at one point.

The ramp and the gap to the run

The ramp runs at 45 degrees with slats every 3 in for grip, the slat spacing Penn State gives for ramps. Our run stands on its own posts, 7 in off the coop wall so it clears the eave. That 7 in gap would be a way in, so a short hardware cloth chute closes it around the ramp on all four sides, and the run’s coop end is a full mesh wall with a framed pass-through at the pop door.

A raised floor with mesh underneath

Height is the defense Oregon State names against the animals that come in from below, and a raised floor is also one you can look under every time you visit.

How high to raise it

Oregon State asks for at least 1 ft off the ground against rats, snakes, raccoons and skunks, with a solid floor such as concrete or solid wood. Our default is 24 in. That figure is ours, not a source’s: NC State notes that a raised coop leaves a dry, shady spot underneath for dust baths and lets you collect eggs and clean without stooping. In the designer you cannot go below 12 in, and anything from 12 in to just under 24 in shows amber.

Hardware cloth under the floor frame

Utah State recommends heavy-gauge wire mesh beneath the subfloor to discourage predators, and warns that small rodents can get in through holes the size of a nickel or a quarter. Our plan screws a 48 x 96 in sheet of the same 1/2 in hardware cloth across the underside of the floor frame of the 4x8 coop, under a solid plywood floor.

Does the space underneath count as run?

Only when it is closed in. UC Davis points out that if hens gather under the coop, the floor above them must be solid. Our rule, which is editorial and still under review, counts the space under the coop as run only when the mesh closes it, the floor is solid and there is at least 18 in of clear height. On the worked example the clear height under the floor frame is 14.25 in, so the designer does not count it and the 8x8 run carries the flock on its own.

A covered run roof against hawks and owls

Penn State’s wording is the clearest: to prevent problems with hawks and owls, cover outside runs with mesh wire or netting. NC State adds that a fully secure run needs a wire or solid roof over the entire run area, and Oregon State and Colorado State want the top closed as well.

Panels or mesh

Our default roof is corrugated polycarbonate panels rather than mesh, because a mesh roof carries no snow. The designer shows a mesh roof as amber up to 30 psf of snow load, with a reminder to brush it off after every storm, and red above 30 psf, where a loaded mesh roof can pull the run down. An open run is amber too, with the note that it lets hawks and owls in.

How the panel roof is framed

For the example run, the engine uses five 26 in x 10 ft panels on 2x6 purlins every 24 in, falling 1-1/2 in per foot away from the coop. That slope is the panel maker’s minimum recommended slope in Palram’s Suntuf guide, and the same guide rates the panels for 40 psf on supports 24 in apart, above the 30 psf snow load the example is designed for.

A run you can walk into

NC State asks for a run tall enough to enter standing upright, and gives no number. Ours is 72 in at the low end and 84 in at the coop end, with a 30 in door that opens out. The posts are 4x4 pressure-treated lumber at most 6 ft apart, set 24 in in the ground, deeper where your frost line asks. NC State also asks for the run to extend at least 6 ft from the coop; the example run goes 8 ft.

Worked example: a 4x8 coop for six hens with an 8x8 run

Here is what the engine produces with its defaults for a 4x8 gable coop, six standard laying hens and an 8x8 covered run. Every figure comes from that one run of the engine.

The space checks

The 10 sq ft of run per bird is the figure Virginia Tech (2023), the Cooperative Extension and Colorado State give, and every square foot of it sits inside the same mesh, apron and roof. For your own flock size, the run size calculator does the same arithmetic.

The predator proofing on the shopping list

Where the mesh goes

On the coop, the hardware cloth covers the eave vent strips on both sides, the gable vent on the back wall and the underside of the floor frame. On the run, it covers the two side walls, the far end around the door, the coop end with the pass-through cut out, the door itself, the ramp chute and the apron. Vents need mesh too: an unscreened vent is an open window, and our ventilation guide explains where they go.

Habits that finish the job

Hardware does most of the work, but UNH Extension is clear that a few routines decide the rest.

Lock up at dusk

UNH suggests training hens to go inside in the evening by feeding and watering them in the coop at dusk, then closing and securely fastening all the doors until morning. A pop door left open one night undoes the whole build.

Clear cover and food around the coop

UNH advises keeping brush, debris and tall grass away from the coop, since they give predators cover, storing feed in airtight containers, cleaning up spills and keeping compost and garbage away from the run. It also suggests siting the coop away from trees and other perches that hawks and owls could use.

Know what you may not do

UNH reminds keepers that hawks and owls are federally protected and that killing them is illegal, and points to USDA Wildlife Services before any trapping or removal. That is one more reason the roof over the run matters: it protects the flock without touching a protected bird.

Putting it into your own design

A predator proof chicken coop is easiest to get right on paper, before any mesh is cut, because every detail above depends on the size of the coop and the run.

Change a value, see the check

Every value in this guide is a default you can change in the coop designer, and each change runs the same checks: chicken wire goes red, an open run or a floor under 24 in goes amber, and a buried or a surface apron both pass. Make the run wider and the apron, the mesh rolls, the staples and the screws all recount.

Start from a plan with the run drawn

If you want the run already drawn to these rules, start from the coop with run plans, or from the standalone chicken run plans if your coop already exists. When the checks are green, the builder’s plan for your exact design is $29, with the cut list, the mesh cuts and the full hardware list. For the build order from the ground up, see how to build a chicken coop.