A closed, hard-sided compost bin is the best starting point, but a lid alone may not stop animals that can dig underneath or find food nearby. Secure the bin, cover scraps, maintain the pile, and remove other easy food sources. If you live in bear country, follow local wildlife guidance rather than relying on ordinary rodent or raccoon fixes.
1. Choose a closed bin with a secure lid and door
Use a hard-sided bin with a lid that stays shut, and secure any access door after adding material. USDA APHIS Wildlife Services includes a closed compost bin among its recommendations for discouraging wildlife, while UVM Extension recommends a hard-sided bin with a lid. These measures reduce access from above and through openings, but they do not address animals digging or tunneling beneath the bin.
In bear country, Vermont Agency of Agriculture guidance recommends a durable container with a lid that is difficult for a bear to open, or electric fencing. Check local wildlife advice for your area; the available guidance does not establish that any particular commercial bin or tumbler is bear-proof.
2. Protect the base from digging and tunneling
Rodents may enter from below, so consider a barrier under the bin as well as a secure lid. UVM Extension specifies a sheet of 1/4-inch hardware cloth laid on the ground, a few inches wider than the bin base so the edges extend beyond it. An Oregon State Extension response gives a different specification—1/2-inch welded hardware cloth—as part of rat-exclusion advice. These are recommendations from different sources and contexts, not a single universal mesh rule. Match the barrier and installation to the animal you are trying to exclude and your bin.
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3. Bury fresh scraps and cover them with browns
Put new food scraps into the pile rather than leaving them exposed on top, then cover them completely with dry “brown” material such as leaves, straw, wood chips, or shredded cardboard. This reduces the food odors and visible scraps that can attract animals. The Kauaʻi County Earth Machine manual also advises burying fresh additions and fastening the door.
For areas with bear problems, UVM Extension reports that Vermont Fish and Wildlife recommends using three times as much brown material as green material. This is a locally attributed bear-country recommendation, not a universal composting ratio.
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4. Maintain the pile and secure it after each addition
Turn the pile regularly and keep it damp rather than wet. UVM Extension suggests turning every other week and covering the pile with additional browns afterward. Oregon State Extension notes that a tumbler helps mix material, while a fixed bin needs regular stirring to help build and retain heat. Whatever the bin type, close and secure the access point after adding scraps.
Oregon State Extension’s April 7, 2026 response by wildlife ecologist Dr. Dana Sanchez emphasizes that exclusion works best alongside careful construction and movement of the mix. A barrier can help, but it is not a substitute for managing what is in and around the bin.
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5. Remove other food rewards and tailor the fix
Animals may keep visiting if another easy meal is available nearby. Secure garbage, keep pet food and bird food inaccessible, clean food scraps and grease from grills, and check for spilled birdseed or feed. Michigan DNR recommends these kinds of steps for reducing raccoon access and cautions that retail deterrents such as lights and chemical repellents may work only briefly. Treat scare devices as supplements, not dependable stand-alone solutions.
What you put in the compost can matter too. In its advice about rats, Oregon State Extension recommends hot composting and avoiding meat, dairy, bread, and oil. UVM Extension also advises against dog or cat waste, meat or fish, dairy, and oil; it cautions against unrinsed eggshells. Follow your local composting guidance, especially if you are managing a particular pest.
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Match the setup to the animal
| Situation | Most relevant measures | What to keep in mind |
|---|---|---|
| Rodents that may tunnel | Secure the lid and door; consider a hardware-cloth base barrier; bury scraps, cover with browns, and maintain the pile. | UVM Extension specifies 1/4-inch hardware cloth; Oregon State Extension names 1/2-inch welded hardware cloth in its rat-exclusion advice. The recommendations differ by source and context. |
| Raccoons and other animals attracted to accessible food | Use a closed bin, secure garbage and pet or bird food, clean grills, and cover scraps. | Michigan DNR cautions that deterrents such as lights and chemical repellents may only work briefly. |
| Bears | Follow local wildlife guidance; Vermont Agency of Agriculture recommends a durable container with a hard-to-open lid or electric fencing. | Do not assume an ordinary tumbler or a named product is bear-proof without product-specific evidence and local advice. |
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