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Irrigation, Soil & Fertility TimingManure Composting Calendar
Composting manure takes months, and the calendar has to account for building the pile, the active phase, curing and a safe window to spread it.
Key points
- Composting stabilizes manure but does not remove every risk.
- Mix with carbon material and manage moisture.
- Follow your program's temperature and turning requirements.
- Cure the pile and test with seeds before using it on seedlings.
- Check food safety, organic and state manure rules.
Why compost manure?
Raw manure can carry pathogens, weed seeds and a lot of readily available nitrogen. Composting stabilizes it, reduces volume and makes it easier to handle and store. It does not remove every risk, so handling and application rules still matter.
Start by assessing what you have: type of manure, bedding, moisture and how much space and equipment you can devote to the pile.
The source of manure influences the plan. Poultry, horse, cattle and swine manures differ in moisture, nutrients and bedding content, and each needs a different carbon mix. Check extension guides for your type.
When should you build the pile?
Build when you can manage moisture and give the pile attention. Spring and early summer are common for building new piles meant to be ready by fall, while a pile built in fall may sit through winter and finish the next season. Rainy periods are hard on open piles, so cover them or choose a site with good drainage.
Mix manure with carbon-rich material such as straw, shavings or leaves to balance moisture and nutrient ratio. A pile that is too wet or too rich in nitrogen smells and runs off.
Weed seeds and antibiotic or herbicide residues can survive some composting. If you buy manure or hay from outside, ask about herbicide history, since some residues persist and can harm sensitive crops.
How should you manage the active phase?
A well-balanced pile heats up as microbes work. Monitor temperature with a long thermometer if you are following a specific program, and turn on the schedule your program requires. Extension composting guides describe turning frequency and target temperatures for different systems.
For example, if you are following an organic certification standard, your certifier sets required temperature and turning records, and you must follow it. For other situations, ask your state extension service for the method that fits your pile size.
Size the pile to your operation. Plan storage for the volume you produce and the length of the cycle.
What does curing involve?
After the active phase, the pile cools and enters a curing stage where material matures and stabilizes. This takes weeks to months, depending on conditions. Finished compost is dark, crumbly and no longer smells like manure.
Keep it covered or moist but not saturated. Test it with a simple seed germination check before using it on seedlings.
Windrow, bin and static pile systems suit different scales. A small farm may use bins, while a large one uses turned windrows with equipment. Choose a system you can maintain.
When can you apply it, and what rules apply?
Apply to fields or beds in spring before planting or in fall after harvest, on soil that is not frozen or saturated. Use soil tests and local recommendations, since compost carries nutrients that count toward your nutrient plan.
If you grow crops eaten raw, follow food safety rules and any required intervals between application and harvest, including those under the federal Produce Safety Rule and organic standards where they apply. State nutrient management and livestock waste rules differ, so check before you build or spread.
Keep records of pile start, turning and temperature. If you plan to sell compost or follow food safety programs, records are required.
How do you manage odor and runoff?
Site the pile away from wells, streams, ditches and property lines, on well-drained ground. A base of absorbent carbon material and a cover reduce leachate and odor. Divert clean runoff away from the pile.
Some states and counties have setback rules, and livestock operations may fall under waste management regulations. Check before you build.
Weather can complicate things. Cover piles before heavy rain and protect them from drought.
How do you use finished compost in your nutrient plan?
Compost contains nutrients, but much of it is slow to become available. Test it for nutrient content and use the result to credit it in your plan. Compare with soil tests to avoid building up phosphorus.
Apply on workable soil, away from water, and incorporate or leave on the surface depending on your system. Record rates and dates to meet any program or regulation.
Test finished compost for nutrients and salts if you use large amounts, since variation can be large.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.