The Deep Litter Method for Chickens: How Deep, What to Use, When It Fails
The deep litter method means letting coop bedding build up through the cold months instead of cleaning it out every few weeks. Start in early fall with 3 to 4 inches of dry softwood shavings, keep adding as the layer breaks down until it is roughly 6 to 12 inches deep, stir it so it never mats, and pull out wet spots as soon as they appear. Kept dry, it saves work and bedding all winter. Kept wet, it becomes an ammonia problem that your nose will catch too late.
What is the deep litter method?
It is an old idea with a plain name. A 1949 University of Minnesota Extension bulletin described "built-up litter" as litter built up to a depth of 6 or 8 inches and left in the poultry house all winter. Instead of shoveling everything out on a schedule, you keep adding to the layer and let the bottom slowly break down.
The same bulletin listed what keepers get in return: it saves labor, uses less litter, keeps the litter in better condition, insulates the floor and conserves nitrogen for fertilizer. Current home flock guidance from UF/IFAS Extension still names deep bedding as one of the ways to make bedding last longer.
What the method is not: a way to skip coop chores. You trade frequent full cleanouts for frequent small checks. If you are not willing to stir the litter and fish out the wet patches, regular cleaning is the better system for you.
How deep should deep litter be?
The sources land in the same range, but not on one number.
| Source | Start with | Build up to |
|---|---|---|
| University of Minnesota Extension (1949) | 2 to 3 in, when the hens are housed, by early September | 6 to 8 in, by around November 1 |
| UF/IFAS Extension, Litter Management for Home Flocks | 4 in | 12 in, added over time |
A practical way to read that: start at 3 to 4 inches in early fall, top up as the layer settles, and aim for somewhere between 6 and 12 inches by the coldest months. Deeper is not automatically better. As you will see below, moisture is what makes deep litter fail, and a thick layer that stays wet is a bigger problem than a thin one.
What is the best bedding for deep litter?
Dr. Jacquie Jacob of the University of Kentucky, writing for poultry.extension.org, puts it plainly: the best litter is wood shavings from a softwood, such as pine, spruce or hemlock. Good litter is very absorbent, nontoxic to the birds, dries reasonably fast, and is cheap and easy to get.
The common alternatives each come with a catch, according to the same article:
- Straw is prone to caking.
- Shredded paper tends to compact and cake during the first two weeks of use. Glossy paper should not be used at all, because it does not absorb moisture.
- Ground corncobs absorb a lot of moisture, but wet cobs form mold.
- Pine straw cakes over quickly.
- Shavings from wood pallets may carry paint, fuel, pesticide or solvent residue.
Caking is exactly what deep litter has to avoid, which is why every source that covers the method tells you to keep the layer loose.
How to start and run deep litter, step by step
- Start in early fall on a dry floor. Lay 3 to 4 inches of fresh softwood shavings. The Minnesota bulletin started its birds on 2 to 3 inches in early September, UF/IFAS starts at 4 inches.
- Stir the surface often enough that it never mats. UF/IFAS says to stir or turn regularly to prevent clumping. The Minnesota bulletin adds a detail worth keeping: work the top, and leave the fine, broken-down bottom layer undisturbed.
- Top up, do not replace. Add fresh litter only as needed to hold the depth. The Minnesota bulletin warns that much of the benefit of built-up litter is lost if it is removed and replaced during the winter.
- Pull wet spots right away. Wet material around feeders and waterers comes out, and litter from the surrounding floor gets drawn in to replace it.
- Stir more in late winter. The Minnesota bulletin flags January and February as the peak of moisture conditions and calls for more frequent stirring then.
- Clean out once a year. In the Minnesota schedule, the house was cleared when it was prepared for new birds in the fall. UF/IFAS suggests moving the old bedding to a contained area, ideally on an impervious surface, and turning it regularly while it composts.
💡 Pro tip: Before you build the layer up past 6 inches, look at where the bottom of your pop door sits. A doorway cut at floor level ends up below a 12 inch bed of litter. If you plan to add or replace a door this season, we explain how to measure your coop for an automatic door, including the threshold height.
Why your nose is a late warning
Deep litter fails in one way: moisture. Penn State Extension notes that even a slight 5% increase in litter moisture, from 20 to 25% at 75 °F, can increase ammonia release by 140%.
The trouble is noticing it. According to Penn State, the human nose does not recognize ammonia until it reaches about 20 to 30 parts per million, while poultry health guidelines suggest keeping it below 25 ppm for most birds. By the time you smell it, your flock is already at or near that limit. People who are around it every day can stop noticing even irritatingly high levels of 50 to 100 ppm. And elevated ammonia is proven to harm bird respiratory function, which leads to disease challenge.
So treat any sharp smell in the coop as a stop sign, not a quirk of the method. Find the wet zone, take it out, stir, add dry shavings, and look at your ventilation.
When deep litter fails, and how to fix it
| What you notice | What it usually means | What to do |
|---|---|---|
| Sharp ammonia smell | The litter is too wet | Remove the wet zone, stir, add dry shavings, check ventilation |
| A crust or mat on top | Not stirred often enough, or a material that cakes (straw, paper, pine straw) | Break it up, stir more often, switch to softwood shavings |
| Soggy ring around the waterer | Spills soaking in | Remove the wet material and draw in litter from around it |
| Mold in the bedding | Wet material, for example wet corncobs | Remove it and keep that area drier |
| Condensation on windows or under the roof | Moist air is trapped in the coop | Improve ventilation before adding more bedding |
The Minnesota bulletin was blunt about the conditions: built-up litter needs good insulation and ventilation and an allowance of 2½ to 3½ square feet of floor space per bird. A crowded, sealed coop will not keep any litter dry. If your coop drips with condensation on cold mornings, fix that first. We walk through it in coop ventilation in winter.
Deep litter or regular cleanouts?
Deep litter suits keepers who check the coop most days, have a dry floor and good airflow, and want the old bedding for compost. Regular cleanouts suit coops that stay damp, coops with little floor space per bird, and keepers who would rather do one big job than many small ones. Both work. The one that fails is deep litter without the stirring and the wet spot patrol.
The rest of the winter routine, from frozen water to what to skip, is in our winter chicken care guide.
FAQ
How deep should deep litter be for chickens?
Roughly 6 to 12 inches once it is established. University of Minnesota Extension described 6 to 8 inches; UF/IFAS Extension suggests building up to 12 inches from a 4 inch start.
What is the best bedding for the deep litter method?
Softwood shavings such as pine, spruce or hemlock, according to University of Kentucky poultry specialist Jacquie Jacob. Straw and shredded paper cake more easily.
How often do you clean out deep litter?
Usually once a year. Through the winter you add, stir and remove wet spots. The full cleanout comes when you prepare the coop for the next season, and the old bedding goes to compost.
Should I replace the bedding in winter?
No. Add fresh litter to hold the depth instead. University of Minnesota Extension noted that much of the benefit is lost if built-up litter is removed and replaced during winter.
Why does my deep litter smell like ammonia?
It is too wet. Penn State Extension notes that a small rise in litter moisture can sharply raise ammonia release, and that people only smell ammonia at about 20 to 30 ppm, close to or above the 25 ppm guideline for birds.
Deep litter takes care of the floor through winter. The other chore that gets harder in the dark months is closing the coop on time when the sun sets before you are home. Our automatic coop doors open and close on a schedule you set, so that part runs without you.
Sources
- Built-up litter bulletin, University of Minnesota Agricultural Extension, 1949
- Litter Management for Home Flocks, Alicia Halbritter, UF/IFAS Extension Baker County
- Litter Material for Small and Backyard Poultry Flocks, Jacquie Jacob, University of Kentucky (poultry.extension.org)
- Detecting Ammonia in Poultry Housing Using Inexpensive Instruments, Gregory P. Martin and Eileen E. Fabian, Penn State Extension
