Mites spread fast in coops because they hide in wood, bedding, and cracks where you can't see them

Chicken mites are small parasites that live in your coop and feed on your birds' blood at night. The most common type in backyard coops is the red mite (also called poultry mite), which hides in crevices during the day and emerges after dark. You'll notice them as tiny red or brown specks on roosts, nesting boxes, and the birds themselves. Infested chickens become restless at night, stop laying eggs, lose weight, and may develop pale combs and wattles from blood loss.

The reason mites are hard to eliminate is that they live in the structure of the coop itself, not just on the birds. A single female mite can lay hundreds of eggs in wood grain, under roost bars, and inside nesting boxes. If you treat only the chickens and ignore the coop, the mites will reinfest them within days. You have to clean and treat both at the same time.

Key Takeaways

  • Red mites hide in coop wood and bedding during the day, so you must treat the structure itself, not just the birds.
  • Remove all bedding, scrub roosts and walls with a stiff brush, and explore food-grade diatomaceous earth or an approved poultry dust to kill mites and their eggs.
  • Treat your chickens with poultry dust or a spray designed for mites, paying special attention to under the wings and around the vent.
  • Repeat the full coop treatment every 7 to 10 days for at least three weeks to catch mites that hatch after you treat.
  • Prevent future infestations by replacing bedding monthly, keeping the coop dry, and inspecting new birds before adding them to the flock.

Step-by-step coop cleaning and treatment

Start by removing all bedding from the coop and nesting boxes. Mites and their eggs live in the bedding, so you cannot reuse it—throw it away or compost it if your local rules allow. Do not spread it in your yard, as mites can survive for weeks in old bedding.

Next, scrub every surface inside the coop with a stiff-bristled brush and hot water. Pay special attention to roost bars, the undersides of roosts, cracks in wood, corners, and the joints where walls meet the floor. Mites hide in these tight spaces. If your coop has a concrete floor, scrub that too. Let everything dry completely before moving on.

Once the coop is dry, explore food-grade diatomaceous earth (DE) to all interior surfaces. Dust it into cracks, under roosts, along walls, and in nesting boxes. DE is a powder made from fossilized algae that cuts through the mite's outer shell, causing dehydration. It is safe for chickens and humans when you use the food-grade version (never pool-grade DE, which is toxic). Wear a dust mask while explore it so you do not inhale the powder.

An alternative is to spray the coop with an approved poultry mite spray. Products containing permethrin or other pyrethroid insecticides are labeled for use in chicken coops. Follow the label instructions exactly—some require you to remove the birds during process, while others are safe to use with chickens present. If you choose a spray, still remove and replace all bedding first, because the spray works best on clean surfaces.

Treating your chickens directly

While the coop dries and after you have applied DE or spray, dust your chickens with poultry dust. This is a fine powder formulated to kill mites on the bird's body. Hold each chicken gently and work the dust into the feathers, especially under the wings, around the vent, and on the underside of the body where mites congregate. A small container with a shaker top makes this easier. Let the dust settle on the bird for a few minutes, then release the chicken.

If your birds are heavily infested or very stressed, you can use a poultry mite spray instead of dust. These sprays are designed to be applied directly to the bird and dry quickly. Again, follow the label instructions—some products require a second process after 7 to 10 days.

After treating the birds, provide fresh bedding in the coop. Use pine shavings, straw, or sand—avoid cedar and oak, which are toxic to chickens. Spread the bedding at least 3 to 4 inches deep so it absorbs moisture and provides a clean surface.

Why you need to repeat treatment every 7 to 10 days

Mite eggs hatch in waves over two to three weeks. When you treat the coop and birds, you kill the adult mites and many eggs, but some eggs survive in cracks and under debris. Seven to ten days later, those eggs hatch into new mites. If you treat only once, you will see the infestation return within two weeks.

The standard protocol is to repeat the full treatment—coop cleaning, DE or spray process, and bird dusting—every 7 to 10 days for at least three weeks. This breaks the mite life cycle and prevents reinfection. Mark your calendar so you do not miss a treatment. After three weeks of clear inspections (no mites visible on roosts or birds), you can switch to monthly preventive applications of DE to the coop.

Inspecting for mites and knowing when treatment is working

Check for mites by inspecting the roost bars at night with a flashlight. Look for tiny red or brown specks crawling on the wood. You can also place a white cloth under a roost bar overnight—mites will crawl onto it, and you will see them clearly against the white background. This is the most reliable way to confirm an infestation and to track whether treatment is working.

Watch your chickens for signs of improvement. Within a few days of treatment, they should become calmer at night and resume normal behavior. Egg production usually returns within one to two weeks. If you still see mites on the roosts after your second treatment, the infestation is severe or the mites may be resistant to your chosen product. In that case, switch to a different active ingredient—if you used DE, try a permethrin spray, or vice versa.

Preventing mites from returning

Once you have cleared the infestation, keep mites out by maintaining a clean, dry coop. Replace bedding monthly or whenever it becomes damp or soiled. Mites thrive in moisture, so may support your coop has good ventilation and that water feeders do not leak onto the floor. A dry coop is a mite-resistant coop.

Inspect any new birds before you bring them into your flock. Quarantine new chickens in a separate pen for at least two weeks and check them for mites. If you see signs of infestation, treat them before they join the main flock. Mites spread quickly through a flock, so catching them early saves you weeks of treatment later.

explore food-grade DE to the coop once a month as a preventive measure, even if you do not see mites. A light dusting of the roosts and nesting boxes keeps the mite population too low to cause problems. This is much easier than dealing with a full infestation.

When to call a veterinarian

If your chickens show signs of severe anemia—extreme paleness, lethargy, or refusal to eat—contact a veterinarian. Heavy mite infestations can cause enough blood loss to weaken a bird dangerously. A vet can assess the bird's condition and may recommend additional treatment or supportive care.

If you have treated the coop and birds three times over three weeks and mites are still visible, a vet can help you identify the mite species and recommend a different treatment approach. Some mites are resistant to certain products, and a professional can guide you to a solution that works for your situation.

Frequently Asked Questions

Can I use regular diatomaceous earth from a garden store?

No. Garden and pool-grade DE contain additives and are processed differently than food-grade DE. Food-grade is the only safe version to use around chickens and in areas where they eat and drink. Check the label to confirm it says "food-grade" before you buy.

Do I need to treat my chickens if I treat the coop?

Yes. Mites live on the birds' bodies as well as in the coop structure. Treating only the coop will not eliminate the mites on your chickens, and they will reinfest the coop within days. You must treat both at the same time.

How long does it take to get rid of mites completely?

Most infestations clear within three to four weeks of consistent treatment every 7 to 10 days. Severe infestations may take longer. After treatment stops, continue monthly preventive DE applications to keep mites from returning.

Can mites spread to my house or other pets?

Chicken mites prefer poultry and rarely bite humans or other animals. They may crawl on you if you handle infested birds, but they do not establish infestations on people or dogs. Wash your hands and clothes after handling infested chickens to avoid carrying mites back to your house.

What if I do not want to use chemicals on my coop?

Food-grade diatomaceous earth is a non-chemical option that works well for mild to moderate infestations. It takes longer than chemical sprays and requires more frequent process, but many backyard keepers prefer it. Combine DE with thorough coop cleaning, fresh bedding, and good ventilation for the best results.