CoopCastle Security Guide
The Ultimate Fox-Proof Chicken Coop Guide: The Fortress Method
In Australia, it's not a matter of "if" a fox will find your coop, but "when." Standard chicken wire won't stop a determined predator. You need a design that targets the three ways foxes attack: digging, climbing, and chewing.
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Calculate exactly how much 1.6mm welded mesh you need for your run dimensions — no guesswork, no waste.
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Fox-proofing is only half the battle. Check our Climate Suitability Guide to ensure your breed is hardy enough for your local region.
Open the Climate Suitability Guide →Coop Predator Security Audit
Tick every defence measure your coop currently has.
Security Score
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⚠️ High Risk
Foxes can easily breach this setup. Start with a mesh apron and secure latches — these two changes alone close the most common attack vectors.
Floor & Foundation
The Ground Defence
Wire & Enclosure
The Perimeter
Sky & Night Defence
The Lockup
The Three-Point Defence
Every fox attack exploits one of three weaknesses. Address all three and your coop becomes a genuine fortress.
Safety Audit · Pro-Tip
Is your coop actually fox-proof? Use our 2026 Security Audit Tool and Predator Mesh Estimator to find the weak spots before it's too late.
The Dig-Proof Apron
Stop Foxes Before They Start
Foxes are relentless diggers. They'll work along the base of your coop looking for soft ground, and they'll dig underneath a wall in minutes if the soil is loose enough.
The most effective defence isn't digging mesh straight down—it's laying a horizontal apron that extends 30cm outward from the base of the coop walls. When a fox starts digging at the perimeter, it hits mesh immediately and can't get past it.
Bury the apron just beneath the surface (5–10cm deep) and cover with soil or gravel. Over time, grass grows through it and it becomes invisible. This is far more effective than digging a deep trench, which foxes can simply dig around.
CoopCastle Standard
30cm horizontal apron of 1.6mm welded mesh, buried 5–10cm deep, secured to the coop base with galvanised ties.
The "Chew-Test" Mesh
If You Can Bend It, a Fox Can Bite Through It
Standard chicken wire is hexagonal, thin, and designed to keep chickens in—not predators out. A fox can tear through it in under a minute with its teeth.
Never rely on standard hexagonal chicken wire to stop a predator; you must use heavy-duty fox proof wire or a minimum 1.2mm gauge galvanized welded wire mesh with spacing no larger than 12mm x 12mm to prevent chewing and reaching through. This specification is the minimum acceptable for any Australian backyard exposed to foxes, quolls, or roaming dogs.
The CoopCastle standard requires 1.6mm welded steel mesh. Here's the quick field test: pick up a piece of the mesh and try to bend or flex it with your fingers. If it gives easily, it's not fox-proof. Proper 1.6mm welded mesh is rigid and resists hand pressure.
Use this mesh on every opening: doors, windows, ventilation panels, and the entire run. There are no "secondary" openings—a fox will find the weakest point and exploit it.
❌ Don't Use
Chicken wire, plastic mesh, thin hardware cloth (<1mm)
✓ Use
1.6mm welded galvanised steel mesh (12.5mm–25mm aperture)
For the gold standard in predator protection, we recommend the 19mm × 19mm × 1.2mm Heavy Duty Mesh found in our Hardware Catalog.
The Anti-Climb Roof
A 2-Metre Fence Is Not Enough
Many backyard keepers assume a tall fence will deter foxes. It won't. Australian foxes are agile climbers and can scale a 2-metre wire fence with ease—especially if it flexes under their weight.
The only reliable solution is a fully enclosed run with a mesh roof. This protects against foxes climbing over, cats dropping in, and birds of prey (wedge-tailed eagles, goshawks) swooping from above.
The roof mesh can be lighter gauge than the walls (standard aviary mesh is acceptable) since foxes can't exert the same biting force from above. But ensure there are no gaps at the joins—foxes will push through any weakness.
Pro Tip
Angle the roof slightly so rain runs off rather than pooling. Standing water on mesh roofs can rust weaker materials within a single wet season.
Bonus: Snake & Rodent Defence
Foxes aren't your only threat. Snakes are attracted to eggs and chicks, while rodents steal feed and introduce disease. Standard 25mm mesh stops foxes but lets both through easily.
The fix: install a secondary layer of 10mm × 10mm mesh on the bottom 60cm of your coop and run walls. This fine mesh blocks snakes, mice, and rats while maintaining airflow.
Pay special attention to the areas around doors and ramps—these are the most common entry points for smaller predators.
Fox-Proof Chicken Ladders & Entries
Lock Down Every Door at Dusk
Fox proof chicken ladders and entries are often the weakest link in an otherwise secure coop. Foxes are opportunistic and patient—they will test every door, ramp, and pop-hole nightly until they find a gap.
- 1.Heavy timber doors — Use solid hardwood or marine-grade ply at least 19mm thick. Lightweight plastic or thin ply can be pried or chewed through.
- 2.Automated nocturnal predator-safe doors — A timer- or light-sensor-activated door removes human error. The door must drop or slide into a metal channel so a fox cannot lift or paw it open.
- 3.Lock down completely at dusk — All entries, including maintenance doors and egg-collection hatches, must be secured with barrel bolts, padbolts, or carabiner clips. A simple latch is not enough; foxes can manipulate basic catches.
- 4.Ramps with side walls — If your coop uses an elevated ramp, add 10cm side walls and hinged ramp covers so the entry is sealed when birds are inside.
Builder's Note
Treat every entry as a potential breach point. If you can slide a credit card through a gap, a fox can exploit it. Seal all gaps larger than 6mm with timber strips or metal flashing.
Calculate Your Security Needs
Use our Predator-Proof Mesh Estimator to calculate exactly how much 1.6mm welded mesh your coop and run require.
Open Mesh Estimator🛡️ Run a Full Security Audit on Your Coop
Use our interactive 5-point checklist to verify your coop meets the 1.6mm Fortress Standard.
Start the Security Audit →Building a new castle from scratch? Start with our complete Coop Design pillar guide — covering size, ventilation, nesting, and the full Fortress Standard from the ground up.