A rat problem in the poultry yard is rarely about the hens themselves. Rats come for the feed, the spilled grain under the feeder, the eggs left overnight and the warm, dry shelter of the coop walls — and once a colony is established it will grow as long as those four things stay on offer. Killing individual rats without changing the setup achieves nothing, because the next litter simply moves into the same food supply. Work on the coop and the feed store as one system: starve them, shut them out, then keep checking.
Seal the feed before anything else
Grain stored in sacks, open plastic tubs or a hopper left ajar is an open invitation, and rats chew through plastic and wood without effort. Transfer all poultry feed into metal bins with tight-fitting lids — galvanised dustbin-style containers work well — and keep the bins up on pallets so you can see droppings or gnaw marks underneath. Sweep the feed store floor daily, because the thin scatter of spilled pellets under a sack is a full meal for a rat even when the main supply is sealed. In the coop itself, take feeders in at night or use treadle feeders the hens operate by weight, and collect eggs every evening so there is nothing protein-rich waiting in the nest boxes after dark.
Block the gaps rats actually use
A young rat can squeeze through a hole roughly the width of an adult thumb, and adults exploit gaps around door frames, pipe entries, vent openings and the junction between coop walls and floor. Walk the building slowly with a torch and mark every opening, then cover vents and gaps with welded hardware cloth of a fine gauge — the stiff welded mesh sold for aviaries — fixed with screws and washers rather than staples a rat can work loose. Chicken wire is not a barrier here: its thin strands part under chewing. Pay attention to the pop-hole and the main door, which often sit clear of the ground; a metal kick plate along the door bottom closes the gap hens ignore and rats do not. Where the coop sits on soil, bury a skirt of mesh around the base so burrowing runs hit metal instead of a way in.
Trapping without endangering the hens
Where rats are already inside, place snap traps inside closed trap boxes or lengths of pipe positioned along walls and runs, where hens, dogs and wild birds cannot reach the mechanism. Loose poison bait around poultry is a poor bargain: a poisoned rat dying in the open can be eaten by hens, dogs or owls, passing the poison up the chain. Traps in boxes, checked daily, tell you whether numbers are falling and where the runs are. Outside, clear the harbourage rats travel through — bramble piles, stacked timber and long grass tight against the coop wall all give covered routes between the hedge and the feed store door.
Make the check a named, dated job
Rat control fails when it depends on memory: the one evening nobody sweeps is the evening the colony feeds. Fix a short closing routine — feeders in, eggs collected, bins lidded, trap boxes checked, door gaps eyeballed — and put it on a rota so a second person covering the yard does exactly the same steps in the same order. On KinsLe, Care Teams carries that closing routine as an assigned duty for the coop, so whoever is on yard duty that evening works through the same list and the finished sweep is timestamped against the flock's record.