Preventing Rats and Mice Around the Coop

If you keep hens, whether in a suburban back garden or on a smallholding, you will eventually meet a rodent. It is not a sign of poor husbandry—rats and mice are simply opportunists that follow food and shelter. But left unchecked, they can cause real problems for your flock, from disease to disturbed sleep and eaten eggs. The good news is that a few consistent habits will keep them at bay.

Why Rats and Mice Are More Than a Nuisance

Rodents are not just unpleasant to see. They carry diseases such as salmonella and leptospirosis, which can affect both your hens and you. They contaminate feed with urine and droppings, and they can spread parasites like mites and worms. Mice will happily squeeze through a gap the width of a pencil (about 7mm), whilst rats need only 20mm—roughly the size of a 50p piece. A pair of mice can produce hundreds of offspring in a year, so a small problem becomes a large one quickly. Hens may be stressed by rodents scurrying about at night, leading to fewer eggs and poorer health. Rats can also kill chicks and eat eggs, and they will gnaw through wood, plastic, and even electrical cables.

Store Feed in Metal Bins and Keep It Sealed

The single most effective step is to make your feed impossible to reach. Use galvanised metal bins with tight-fitting lids. Plastic bins and sacks are no barrier—rats will chew straight through them. Keep bins off the ground on a pallet or sturdy shelf, and pull them away from walls so rodents cannot climb up behind them. Buy only as much feed as you can use in a few weeks, and decant it straight into the bin. Consider a treadle feeder, which your hens step on to open; it keeps feed covered when the flock is not eating. Store supplements, scratch grain, and treats the same way. Even a small bag of corn left in a shed is an invitation.

Clear Spilled Grain and Other Temptations

Rodents follow their noses, so remove the scent of food. Sweep up spilled grain every single day—around the feeder, under the drinker, and along the run. A fine brush and dustpan make quick work of it. Do not leave feed out overnight; if you use a feeder that cannot be sealed, bring it in or empty it. Windfall fruit, fallen berries, and garden produce should be cleared regularly. Keep compost heaps well away from the coop, and use enclosed bins rather than open piles. If you give kitchen scraps, do so in a shallow tray and remove anything the hens have not eaten within twenty minutes. A tidy coop is a rodent-unfriendly coop.

Block Entry Points to the Coop and Run

Walk around your coop and run with a torch, looking for gaps. Pay attention to corners, under the floor, around doors, vents, and where pipes enter. Use galvanised wire mesh with holes no larger than 6mm and fix it securely with staples or screws—not just nails, which rats can pull out. For wooden coops, repair any rotten boards. For runs, bury the mesh at least 30cm deep, or create an L-shaped apron that extends outwards at ground level. Rats can climb and burrow, so check the roof and eaves too. Fill small gaps with wire wool, then seal over with expanding foam or cement. Mice can jump and climb almost anything, so do not overlook high openings.

Manage the Surroundings and Act Early

Habitat management is your best long-term defence. Keep the area around the coop short-mown and free of clutter. Remove piles of wood, bricks, old machinery, and long grass that provide cover. Trim shrubs so they do not touch the coop. Check weekly for signs: droppings, grease marks along walls, burrows, or gnaw marks. If you see any, act immediately. Snap traps in tamper-resistant boxes are effective and safe around hens. Avoid poison unless you can use secure bait stations and follow UK rules—secondary poisoning can kill owls, cats, and dogs. A leaky drinker or gutter provides water, so fix leaks. You will never make your plot perfectly rodent-proof, but you can make it far less attractive. A little diligence each day keeps your hens safe, healthy, and undisturbed.