The deep litter method is a way of managing your chicken coop floor by letting bedding and droppings build up over time instead of cleaning them out every week. As carbon-rich bedding mixes with nitrogen-rich chicken manure, microorganisms break the waste down into compost right on the coop floor. The process generates heat, controls odor, and produces usable garden compost, all while cutting your cleaning schedule down to once or twice a year.
How the Composting Process Works
The biology behind deep litter is the same as any compost pile. Microorganisms need carbon for energy and nitrogen for protein synthesis. Your bedding (leaves, wood shavings, straw) provides the carbon, and chicken droppings provide the nitrogen. When the ratio sits around 25 parts carbon to 1 part nitrogen and moisture stays in the 45 to 55 percent range, bacteria and fungi break organic matter down into simpler nutrients. The chickens themselves act as turners, scratching through the litter and aerating it as they forage.
This decomposition generates heat. One well-known benefit is that a properly managed deep litter floor can keep a coop 10 degrees or more above the outside temperature during winter, combining with the chickens’ body heat to provide a natural warming effect. That thermal boost makes this method especially popular in cold climates, though it also means deep litter is generally not appropriate during the warmer months, since the extra heat in a summer coop can stress your birds.
Best Bedding Materials
You want materials that are loose, absorbent, and dry so the chickens can scratch manure into them easily. The most common choices are:
- Kiln-dried pine shavings: Widely available at farm supply stores, highly absorbent, and easy for chickens to work through. This is the most popular option.
- Wood shavings (not kiln-dried): Also work well, though they may contain more moisture initially.
- Dry shredded leaves: Free in autumn and excellent as a carbon source. They mix well with shavings.
- Straw: Works on a constructed (wood or concrete) floor but can compact and hold moisture over a dirt floor, creating conditions for a mold called aspergillus that causes severe respiratory problems in both chickens and humans. If you use straw, keep adding fresh layers and watch for compaction.
- Wood chips: Fine for deep litter, but only after they’ve dried and aged. Fresh green chips straight from a live tree need time to break down before going into the coop.
Avoid cedar shavings and other aromatic woods, which contain oils that can irritate chickens’ respiratory systems. Black walnut shavings are also toxic to poultry.
A mix of materials often works best. A combination of fall leaves and wood shavings, for example, provides good aeration and absorbency while decomposing at a steady rate.
How to Start Deep Litter
Begin with a 4 to 6 inch layer of your chosen bedding material spread evenly across the coop floor. This initial depth gives the microorganisms enough carbon to start working once droppings accumulate. Over the following weeks and months, you’ll add fresh bedding on top whenever the surface looks wet, matted, or heavily soiled. Most people simply toss a few handfuls of shavings or leaves over visible droppings and let the chickens scratch it in.
The litter gradually builds up. By the end of winter, you might have anywhere from 8 to 14 inches of material, depending on your flock size and how often you add bedding. The goal is to keep the surface layer dry and the deeper layers actively composting.
Ongoing Maintenance
Deep litter is low-maintenance, not no-maintenance. Your main jobs are adding fresh carbon material and making sure the litter stays aerated. If your chickens aren’t turning the litter enough on their own (smaller flocks in larger coops, for instance), you can rake or fork through it periodically. Scattering scratch grains into the bedding encourages the birds to dig through it themselves.
The two things to watch for are moisture and compaction. Wet, packed-down litter goes anaerobic, meaning decomposition shifts from a healthy composting process to a rotting one that produces ammonia and foul smells. If you notice damp spots or matted areas, fork them up and add dry bedding immediately. The litter should feel dry and crumbly on the surface, with a mild earthy smell underneath.
Ammonia: The Key Warning Sign
Ammonia is the single biggest health risk with deep litter done poorly. Research on broilers has shown that ammonia levels below 15 parts per million (ppm) cause no measurable harm, but once concentrations reach 25 ppm, chickens suffer damage to their respiratory systems, reduced immunity, and lower productivity. At 50 ppm, ammonia can damage the corneas and blur vision, making it hard for birds to find food.
You don’t need a meter to catch a problem early. If you can smell ammonia when you open the coop door, levels are already high enough to be concerning. The fix is straightforward: add a thick layer of dry carbon material, turn the litter to improve airflow, and make sure your coop has adequate ventilation. Ventilation is non-negotiable with deep litter. Moisture from droppings and the birds’ breathing needs a way to escape, typically through openings near the roofline that let damp air rise and exit without creating a cold draft at roost level.
Which Coop Floors Work Best
Deep litter works on dirt, wood, and concrete floors, but each type needs different preparation.
Dirt floors are the most traditional pairing. The soil introduces beneficial microorganisms that jump-start decomposition, and moisture can wick downward. The trade-off is that rodents can burrow up from below, and straw over a dirt floor carries a higher risk of aspergillus mold growth. Stick with shavings or leaves on dirt.
Wood floors need protection from moisture. Chicken manure and composting bedding will rot untreated plywood surprisingly fast. Coating the floor and a few inches up the walls with a rubberized sealant or waterproof paint creates a barrier. Some keepers lay cheap vinyl plank flooring over plywood for a waterproof, washable surface. Use sturdy solid wood or plywood, not particleboard, which will disintegrate when it gets damp.
Concrete floors are naturally moisture-resistant and easy to seal. They work well with deep litter, though they’re colder than wood or dirt, which makes the composting heat especially welcome in winter.
Cleanout Schedule and Using the Compost
The traditional deep litter schedule calls for one full cleanout per year, typically in spring. You remove all the built-up material down to the bare floor, spread it in the garden or add it to a compost pile for final curing, then start fresh with a new 4 to 6 inch base layer. Some keepers prefer cleaning out twice a year, in spring and fall, especially with larger flocks that produce more waste.
When you do a full cleanout, leave a thin layer of the old litter behind. This “starter” layer is rich in the beneficial microbes that drive decomposition, and it helps the new bedding start composting faster, much like saving a bit of sourdough starter for your next loaf.
The material you remove is partially composted and rich in nutrients. If it’s been decomposing for six months or more, it’s often ready to apply directly to garden beds. If it still contains visible bedding and has a strong smell, let it finish composting in a pile for another month or two before using it around plants.
Common Mistakes to Avoid
Most deep litter failures come down to one of three problems: not enough carbon, not enough ventilation, or not enough turning. Skimping on fresh bedding lets manure accumulate faster than microbes can process it, creating a wet, ammonia-heavy mess. Poor ventilation traps moisture and gases inside the coop. And litter that sits undisturbed compacts into anaerobic layers that smell terrible and harbor pathogens.
Another common mistake is starting deep litter in summer. The heat generated by decomposition is a benefit in November but a liability in July. If you want to try this method, begin in early fall so the litter is well established by the time cold weather arrives, then do your cleanout in spring before temperatures climb.