How to Keep Rats Out of a Compost Bin

Keep rats out of a compost bin by removing what they came for and closing the way in: no meat, fish, dairy, oils, bread or cooked food in the bin at all, half-inch galvanized hardware cloth under and around any ground-standing bin, and keep the contents damp and turned rather than dry and undisturbed. If you already have rodents, the reliable fix is a format change -- an enclosed tumbler raised off the ground has no ground contact and no cavity to nest in, and that ends the problem rather than managing it.

1. Calorie-dense food. Vegetable peelings are not worth a rat's effort. Cooked rice, bread, meat scraps, cheese and anything oily are, and they are the single biggest driver.
2. A dry, warm, undisturbed cavity. A neglected bin full of dry material is excellent nesting habitat quite apart from the food. Rats will nest in a bin they are not even eating from.
3. Easy access. A gap under a bin, a loose lid, a cracked panel or an open heap all count. A rat can get through a gap of around half an inch.
4. Water nearby. Little you can do about this one, but it explains why some gardens have a problem and neighboring ones do not.

Remove the first two and the bin stops being interesting. That is the whole strategy, and it is more effective than anything you can buy.

• Never: meat, fish, bones, dairy, cheese, eggs (shells are fine), oils, fat, butter, salad dressing, cooked food of any kind, bread, pasta, rice.
• Fine: raw fruit and vegetable scraps, peelings, coffee grounds and filters, tea, crushed eggshells, garden trimmings, leaves, shredded cardboard and paper.
• Caution: large amounts of fruit in hot weather draws flies and, eventually, attention. Bury it under browns rather than leaving it on the surface.
• Bury every addition. Open a hole in the existing material, tip the scraps in, pull material back over them. Surface scraps are an invitation.

Home compost piles do not reach the temperatures needed to deal with meat, dairy and cooked food safely in any case, so this list is not just about rodents -- it is the same list in what to put in a compost bin for independent reasons.

The hardware cloth detail matters: half-inch galvanized mesh, not chicken wire. Chicken wire has a hexagonal mesh typically an inch or more across and rodents pass through it easily. Cut the mesh to the bin footprint plus a few inches, lay it down first, then stand the bin on it and turn the surplus up the inside of the walls so there is no gap at the junction.

Quick picks

#	Product	Best for	Score	Price
1	Top pickFCMP Outdoor IM4000 Tumbling ComposterDual chamber, roughly 37 gal total	Most backyards	9.1★★★★★	Check price on Amazon
2	Envirocycle ComposterTumbler drum on a liquid-collecting base	Patios and small yards	8.0★★★★★	$349.99 - View on Amazon
3	Redmon Green Culture 65-Gallon Compost Bin65 gal enclosed bin with lid and access doors	A lidded static bin	8.1★★★★★	$69.99 - View on Amazon

#ad We may earn a commission - Price as of October 11, 2026

Scores are our own editorial judgment, formed from published specifications and independent sources. They are not aggregated customer ratings, and they are not the result of hands-on testing, which we do not currently do. See how we choose.

A correctly managed bin is damp -- like a wrung-out sponge -- and that alone makes it poor nesting material. A bin that has gone dry and matted is comfortable, and a bin nobody opens for two months is undisturbed. Turning the contents every week or two does more to discourage nesting than any deterrent product, and it speeds up the composting at the same time.

If the contents are dry, add water and greens; if they are sodden, add browns and mix. The same balance that makes good compost makes an unwelcoming bin. How to use a compost bin covers the turning and harvesting routine.

Ultrasonic repellers, peppermint oil, used cat litter and the various household deterrents circulated online do not reliably clear rodents from a food source, and some of them -- cat litter especially -- should not go anywhere near a bin you intend to use on food crops. Poison bait near a compost bin is worse than useless: it risks pets, wildlife and children, and it does nothing about the reason the rats came.

Equally, do not stop composting. Kitchen scraps in a garbage can are not less attractive to rodents than kitchen scraps in a bin, and a municipal bin sitting outside the back door is closer to your house.

Away from fences, walls, sheds and dense cover, because rodents travel along edges and under cover rather than across open ground. A bin standing clear in the open with a mown gap around it is visited far less than one tucked behind a shed. On a hard surface rather than long grass if you have the option. And not directly against the house.

None of that substitutes for the food list and the mesh, but it is free. Between the four measures -- no cooked food, buried additions, hardware cloth or an enclosed format, and regular turning -- a domestic compost bin is simply not a rodent problem, which is why extension guidance treats home composting as compatible with ordinary urban gardens.