Start with a bin, brown materials, and green materials

Making compost at home means layering brown materials (dry leaves, shredded paper, cardboard) with green materials (food scraps, grass clippings, plant trimmings) in a container, then letting bacteria and fungi break them down over time. You do not need special equipment—a wooden box, plastic bin with drainage holes, or even a pile on the ground will work. The process takes anywhere from two months to a year depending on how often you turn the pile and what you put in it.

The basic rule is straightforward: aim for roughly three parts brown to one part green by volume. Browns are carbon-rich and help air flow through the pile. Greens are nitrogen-rich and provide the food that microorganisms need to multiply and do the work. Without both, your pile either stays cold and wet or dries out and stops decomposing.

Key Takeaways

  • Layer brown materials (leaves, cardboard, straw) with green materials (food scraps, grass clippings) in a ratio of about 3:1 by volume.
  • Keep the pile as moist as a wrung-out sponge—too dry and decomposition stops, too wet and it smells.
  • Turn the pile every one to two weeks if you want finished compost in two to three months, or leave it alone for six to twelve months for passive composting.
  • Never add meat, dairy, oils, or diseased plants, as these attract pests or spread plant diseases to your garden.
  • Finished compost looks dark brown, crumbly, and earthy-smelling, with no recognizable food scraps or leaves remaining.

Choose a container or location

You can build or buy a bin, or straightforward pile materials on bare ground. A bin keeps rodents out better and looks neater, but an open pile works fine if you have space and do not mind the appearance. If you choose a bin, drill or cut drainage holes in the bottom and sides so excess water can escape—waterlogged compost becomes anaerobic (oxygen-starved) and smells like rotten eggs.

Place your bin or pile in a spot that gets partial shade and is reasonably level. Full sun can dry out the pile too fast in summer. A location near a garden hose makes it easier to water when needed. If you live in a cold climate, placing the bin against a south-facing wall or in a sheltered corner helps retain heat during winter.

Gather brown and green materials

Browns include fallen leaves, shredded newspaper, cardboard (remove tape and labels), straw, wood chips, and sawdust from untreated wood. Greens include vegetable and fruit scraps, coffee grounds and tea bags, fresh grass clippings, plant trimmings, and manure from herbivores (horse, cow, rabbit). Avoid glossy or colored paper, treated wood, and diseased plant material.

Start collecting materials before you begin. Save your kitchen scraps in a container on the counter or under the sink—a small bin with a tight lid keeps odors down. Bag fallen leaves in autumn so you have them on hand year-round. If you have a lawn, save grass clippings after mowing (as long as the lawn was not treated with pesticides). Many communities offer free wood chips from tree trimming services, which make excellent brown material.

Layer and moisten your pile

Start with a 4- to 6-inch layer of coarse brown material (twigs, straw, or wood chips) on the bottom—this creates air pockets and prevents the pile from compacting. Then alternate layers: 3 to 4 inches of mixed browns, then 1 inch of greens, then browns again, until your bin is full or you run out of material. Finish with a brown layer on top to reduce odor and keep flies away.

As you build, water each layer so it is as moist as a wrung-out sponge. If you squeeze a handful, a few drops should come out, but it should not be soggy. Too much water blocks air and creates smell; too little and decomposition slows to a crawl. If your pile gets heavy rain, it may need to drain for a day or two before you add more material.

Turn the pile or let it sit

You have two paths: active composting (faster) or passive composting (hands-off). Active composting means turning the pile every one to two weeks with a pitchfork or shovel, moving material from the outside edges to the center where it is hottest. This speeds decomposition to two to three months because turning adds oxygen and mixes fresh greens into the hottest zone. Passive composting means leaving the pile alone—it takes six to twelve months but requires no work after the initial layering.

If you turn the pile, wear gloves and watch for heat. A healthy, actively decomposing pile can reach 130 to 150 degrees Fahrenheit in the center. You will notice steam rising on cool mornings. If the pile is cold and wet, add more browns and turn it to introduce air. If it is dry and not heating up, add water and more greens.

Know what not to compost

Never add meat, fish, bones, dairy, oils, or fats—these attract rats, raccoons, and flies. Do not compost diseased plants, weeds with seeds, or grass treated with herbicides or pesticides. Avoid glossy paper, coal or charcoal ash (wood ash is fine in small amounts), and pet waste. Citrus peels and onions can slow decomposition if added in large quantities, so chop them small or add them sparingly.

If you have a small kitchen and cannot store scraps for long, freeze them in a container until you have enough to add to the pile. This also prevents odor and pest problems. Chop large scraps into smaller pieces—they decompose faster and take up less space.

Recognize finished compost

Finished compost is dark brown or black, crumbly, and smells earthy like soil. You should not be able to recognize individual food scraps or leaves. It should feel moist but not wet, and it should hold together loosely when squeezed. If you see recognizable pieces of food or leaves, the pile needs more time. Sift finished compost through a 1/2-inch mesh screen to remove twigs and large pieces, then use it in gardens, potted plants, or lawn.

If your pile is still warm and actively decomposing, let it finish before using it. Partially decomposed material can tie up nitrogen in the soil as it continues to break down, temporarily making it unavailable to plants. Once it cools and looks like dark soil, it is ready to use.

Frequently Asked Questions

How do I stop my compost pile from smelling bad?

Bad smell usually means too much moisture or too many greens. Add dry browns like shredded paper or leaves, and turn the pile to add air. Make sure drainage holes are clear. If it smells like ammonia, add more browns. If it smells like rotten eggs, it is waterlogged—add browns and turn it to dry it out.

Can I compost in winter?

Yes, but decomposition slows dramatically in cold weather because microorganisms work slower. An insulated bin or a pile built against a south-facing wall retains more heat. In very cold climates, you may want to keep adding to the pile through fall and let it finish in spring. Frozen material thaws and decomposes once temperatures rise.

Why is my pile not heating up?

A cold pile usually lacks nitrogen (greens) or oxygen. Add more food scraps, grass clippings, or manure, and turn the pile to introduce air. Make sure the pile is at least 3 feet by 3 feet—smaller piles do not generate enough heat. A pile that is too wet will also stay cold; add dry browns and improve drainage.

Can I use compost that still has chunks in it?

Yes, if the chunks are small and soft enough to crumble between your fingers. Large, hard pieces should go back into a new pile or sit longer. You can also sift out the large pieces and return them to the pile while using the finer material in your garden.

How much finished compost will I get from my pile?

Compost shrinks as it decomposes—you typically end up with about one-third the original volume. A 3-foot by 3-foot by 3-foot pile (27 cubic feet) will yield roughly 9 cubic feet of finished compost. The exact amount depends on what you put in and how long it sits.