Rats in the Chicken Coop: Cut the Feed, Not Just the Rats

TL;DR: Rats come for the feed; eggs and chicks are what they find afterwards. So the job is won at the feed store and the feeder, not the trap line — sealed metal or hard plastic containers off the floor, no spilled feed, and feeders closed or removed overnight. Add fine mesh and seal gaps at the base and roofline. Rodenticide near poultry is a real hazard because chickens eat bait; if used at all it must be completely inaccessible to birds.

Trapping without removing the attraction is a permanent job. Removing the attraction is a weekend.

What They Actually Cost You

Feed, continuously and invisibly. This is the largest and least noticed cost — feed is the biggest running expense in any flock, and rats take it every night.

Eggs, taken from nests.

Chicks, which is the loss keepers notice first.

Injury to adult birds, particularly at night.

Biosecurity, because rats move between properties and contaminate feed and water — see backyard flock biosecurity.

Damage — chewed sacks, chewed wiring, burrows undermining structures.

The Signs

Droppings around the feed store and along walls.
Chewed sacks, which also means contaminated feed.
Feed disappearing overnight at a rate that does not match your birds.
Burrows near coop walls or under structures.
Worn runs along the base of walls — rats travel the same routes.
Eggs gone with the hens untouched — see chicken predators for reading the evidence.

Fix the Feed First

This is the part that actually ends the problem.

Storage:

Sealed metal or hard plastic containers. Not sacks — rats chew through them easily, and a chewed sack means contaminated feed that should be discarded.
Off the floor, on a pallet or blocks.
In a closed space where possible.

Feeders:

Close or remove them overnight. Feed sitting in an open trough all night is an invitation.
A treadle feeder stays shut unless a bird of sufficient weight stands on it, and is the equipment answer to this specific problem — see automatic chicken feeders.
Do not overfill, and use a design that does not spill — see DIY chicken feeder.

Ground:

No spilled feed left at the end of the day.
No scraps left uneaten in the run — see kitchen scraps for chickens.
Clear vegetation and clutter back from the walls; it is cover.

Exclusion

Fine mesh, not ordinary large-opening chicken wire, which rats pass or chew.
Seal gaps at the base and roofline, around posts and where materials meet.
Concrete or hard standing under the feed area where you can.
A wire skirt laid flat outward at the base against digging — easier than burying and effective.

See chicken run design and poultry housing design, where rodent exclusion is one of the four things worth spending money on.

Protecting Eggs and Chicks

Collect eggs frequently. Eggs not in the nest cannot be taken, and frequent collection also prevents egg eating.
Brood chicks somewhere secure, with fine mesh and no gaps. Chicks are the loss that hurts — see chick mortality causes.
Roll-away nest boxes remove the egg from reach as soon as it is laid — see nest box design.

On Rodenticide

It is a genuine hazard around poultry, because chickens will eat bait. It appears in what not to feed chickens for that reason.

If it is used at all:

Completely inaccessible to birds, without exception.
Away from feed storage and water.
Consider secondary poisoning of anything that eats a poisoned rat.
Remove the attraction first. Bait competing with an open feed sack is a poor deal for you and a good one for the rats.

Traps have the same requirement: placed where birds cannot reach them.

The Honest Limits Here

The behaviour described — rats attracted primarily by feed, then taking eggs and chicks — and the exclusion and storage measures are standard poultry-keeping practice. This guide names no rodenticide, gives no mesh sizes and recommends no product, because the right specification depends on your structure and because rodenticide use around food-producing animals carries risks that belong to a considered decision rather than a general recommendation. Discard feed from chewed or contaminated sacks rather than using it.

Frequently Asked Questions

Why do rats come into a chicken coop?

For the feed. Eggs and chicks are a bonus they discover later, which is why removing the feed source does more than any amount of trapping.

Do rats actually kill chickens?

They take eggs and chicks, and they can injure adult birds. The bigger everyday costs are the feed they consume and the contamination they leave.

How do I know I have rats?

Droppings around the feed store, chewed sacks, feed disappearing overnight, burrows near the coop walls, and runs worn along the base of walls.

Is poison safe to use around chickens?

Rodenticide near poultry is a real hazard because chickens will eat it. If used at all it must be completely inaccessible to birds, and removing the feed attraction should come first.

What stops rats getting into the feed?

Sealed metal or hard plastic containers, off the floor, and feeders closed or removed overnight. Sacks are not storage — rats chew through them easily.

Does fine mesh keep rats out?

Fine mesh helps, and rats exploit gaps, so sealing openings at the base and roofline matters as much as the wire itself.

Are rats a disease risk?

They are a biosecurity concern — they move between properties and contaminate feed and water, which is reason enough to exclude them.