Composting Chicken Manure: Why, When and How

Last reviewed on 30 April 2026.

The bedding you fork out of the coop is one of the most useful by-products of keeping chickens. Done right, it becomes a dense, balanced compost that vegetable growers pay good money for. Done wrong, it scorches plants, smells of ammonia for weeks, attracts rodents, and risks transferring pathogens to food crops. The difference is mostly in two things: time, and getting the carbon-to-nitrogen mix close to right.

Why fresh manure is a problem

Fresh chicken droppings contain roughly 1.5% nitrogen by weight in a form that is rapidly available to plants — much higher than cow or horse manure. That sounds good, but in practice it means three things. First, fresh manure burns roots and leaves, especially on seedlings and salad crops. Second, much of that nitrogen escapes as ammonia in the first few days, which is the smell you notice when you open the coop. Third, the droppings carry the bacteria of a healthy chicken's gut — including organisms that can be problematic on raw vegetables, the most relevant being Salmonella, Campylobacter and certain E. coli strains.

Composting solves all three at once. Time and microbial activity convert volatile nitrogen into stable organic forms; the heat of an active heap kills most pathogens; and the carbon you mix in soaks up the ammonia and gives the heap structure.

Hot composting versus cold composting

There are two reasonable approaches, suited to different keepers.

Hot composting (fast, hands-on)

You build a single heap in one or two goes, get it hot enough to pasteurise the contents, turn it on a schedule, and finish in three to four months. A working hot heap reaches 55–65°C (130–150°F) in the centre within a few days and holds those temperatures for at least three days during each turn. That temperature range kills most enteric pathogens, weed seeds and parasite eggs. Hot composting needs:

• Volume. A minimum of about 1m × 1m × 1m (≈3ft × 3ft × 3ft) is needed to hold heat. Smaller heaps stay cold.
• The right C:N ratio. Aim for roughly 25–30 parts carbon to 1 part nitrogen by weight. Chicken manure plus its bedding (straw, woodchip, shavings) is usually close to right; if it smells of ammonia, add more carbon.
• Moisture. "Wrung-out sponge" damp. A cover keeps rain off in wet climates; a watering during dry spells helps.
• Air. Turn the heap when the centre temperature drops below ~45°C — typically every 5–10 days at the start.

Cold composting (slow, hands-off)

You add bedding and droppings to a heap or bay as they are generated and let time do the work. The heap never reaches pasteurisation temperatures, so pathogens decline more slowly and weed seeds may survive. Plan on 9–12 months from the last addition before applying anywhere near edibles, and 6 months for ornamentals. Cold composting suits keepers who clean out little and often, but it is less forgiving — heaps that are too wet go anaerobic and smell, and heaps that are too dry never break down.

What to mix in

Chicken manure is the nitrogen ("green") side. The carbon ("brown") side comes from the bedding you cleaned out with it plus extras: straw, dry leaves, untreated wood shavings, shredded cardboard, garden prunings, and most plant kitchen scraps. Avoid cat or dog faeces, glossy printed paper, treated wood, grass clippings from herbicide-sprayed lawns, and any meat, dairy or oily food (which attract rodents).

A simple recipe

1. Site the heap on bare soil if possible — worms and microbes climb in from below. A wood-pallet bay 1m square works well.
2. Lay a base of coarse carbon — small twigs, straw — for airflow.
3. Add a layer of coop sweepings (mix of bedding and droppings).
4. If the bedding looks lean on carbon, add a layer of dry leaves, shredded cardboard or shavings.
5. Repeat layers until the heap is at least 1m × 1m × 1m.
6. Water lightly between layers in dry weather.
7. Cover loosely. A piece of old carpet or breathable tarp keeps rain off without smothering the heap.
8. Turn after 5–7 days. Continue turning whenever the centre temperature drops.
9. When it stops heating after a turn, let it rest ("cure") for at least four weeks before use.

How to tell when it's ready

Finished compost is dark brown to black, crumbly, and smells of forest floor — earthy, slightly sweet. There should be no recognisable bedding, no slimy patches, no ammonia. The volume will have shrunk to roughly half of what you started with. If you can still see whole feathers or large straw fragments, it needs more time.

Application rules

• On vegetable beds: apply finished compost a few weeks before sowing or planting, dug in lightly or used as a 2–5 cm mulch. Avoid contact between the compost and the edible parts of leafy crops, especially low-growing salads.
• On fruit: a generous mulch around bushes and trees in late winter is ideal — they tolerate the higher nutrient load and benefit from the slow release.
• On lawns: a thin top-dressing in autumn, raked in. Excessive nitrogen will scorch.
• On ornamentals: any time of year. Hungry feeders such as roses and dahlias thrive on it.
• On seedlings: never use composted manure neat. Mix at most 25% compost into a seed-raising mix.

Common mistakes

• Not enough volume. Small heaps never get hot. Two or three keepers can pool clean-outs into a shared heap if individual flocks are small.
• Too wet, too packed. A heap that smells sour or sulphurous has gone anaerobic. Turn it, add coarse carbon, and don't water for a week.
• Too dry. A heap that doesn't heat in summer is usually under-watered. The "wrung-out sponge" test is the right target.
• Skipping the cure. Compost that still has microbial heat will steal nitrogen from the soil it's applied to. Let it rest until the heap is at ambient temperature.
• Adding lime. Adding garden lime to compost releases yet more ammonia and does not "sweeten" the heap. Skip it.

Deep-litter coops

Some keepers use the deep-litter method: continuously adding fresh bedding on top of older bedding inside the coop, letting microbial activity take place under the birds. This works in well-ventilated, dry coops and reduces the cleaning frequency, but the litter still has to come out eventually. When it does, treat it as a coop sweep going into either a hot or a cold heap; deep litter is not the same as finished compost. The wet coop guide covers when deep litter is and isn't appropriate for your conditions.

Related guides

• Integrate chickens into your garden — wider context for how chickens and growing spaces work together.
• Wet coop fixes — how to keep bedding dry enough to compost properly.
• Rats and mice — keeping the heap from becoming a rodent attraction.
• Spring guide — the natural time for a full coop clean-out and heap build.
• Equipment checklist — including bedding choices that compost well.