Start with a bin or pile in a shady spot

You can make compost in a straightforward pile on the ground, in a wooden bin you build yourself, or in a purchased compost bin. The easiest method for most home cooks is a bin because it keeps rodents out, speeds decomposition, and takes up less space than a pile. Place your bin or pile in a shady area of your yard—direct sun dries out the pile too fast. Make sure water can drain away from the bottom so the pile doesn't become waterlogged.

If you choose a pile, straightforward mound your materials on bare ground. If you build a bin, use untreated wood, wire mesh, or plastic with ventilation holes. A bin roughly 3 feet by 3 feet by 3 feet works well for most households. The size matters because a pile smaller than 3 feet on each side won't heat up enough to break down materials quickly.

Key Takeaways

  • Layer brown materials (dry leaves, shredded paper, straw) with green materials (grass clippings, food scraps, plant trimmings) in a roughly 3-to-1 ratio of browns to greens.
  • Keep the pile as moist as a wrung-out sponge—wet enough to decompose but not so wet that it smells like ammonia or becomes slimy.
  • Turn the pile every two to four weeks with a pitchfork or shovel to speed decomposition, or leave it undisturbed for four to six months for slower composting.
  • Finished compost is dark brown, crumbly, and smells earthy; it takes two to six months depending on how often you turn it and what you add.
  • Never add meat, dairy, oils, diseased plants, or pet waste—these attract pests or introduce harmful bacteria.

Layer browns and greens in the right ratio

Brown materials are dry and carbon-rich: fallen leaves, shredded newspaper or cardboard, straw, wood chips, and sawdust. Green materials are moist and nitrogen-rich: grass clippings, vegetable scraps, coffee grounds, plant trimmings, and manure from herbivores like horses or chickens. The ideal ratio is roughly 3 parts brown to 1 part green by volume. This means if you add a bucket of grass clippings, add three buckets of shredded leaves or paper on top.

Start your pile or bin with a 6-inch layer of brown material—this allows air to flow underneath. Then alternate: 3 inches of green, 6 inches of brown, 3 inches of green, and so on. If you add kitchen scraps, bury them under a layer of brown material so they don't attract flies. Chop or shred larger materials like leaves and cardboard; smaller pieces decompose faster because microbes have more surface area to work with.

Keep moisture and air at the right levels

The pile should feel as moist as a wrung-out sponge. Squeeze a handful of compost—a few drops of water should come out, but it shouldn't drip. If the pile is too dry, decomposition slows dramatically. If it's too wet, it becomes anaerobic (lacking oxygen), which causes a strong ammonia smell and attracts flies. Water the pile during dry spells, especially in summer. In wet climates, you may need to cover the top with a tarp to prevent waterlogging.

Air is equally important. Microbes that break down compost need oxygen. If you turn the pile every two to four weeks, you're adding air and speeding decomposition to two to three months. If you don't turn it, the pile will still decompose but will take four to six months or longer. Turning is optional—it's faster but requires more work. If your bin has a door at the bottom, you can harvest finished compost from the bottom while still adding fresh materials at the top, which also introduces air.

Turn the pile to speed decomposition

Turning means moving material from the outside of the pile to the center with a pitchfork or shovel. The outside stays cooler and decomposes more slowly, while the center heats up as microbes work. By turning every two to four weeks, you move the cooler outer material into the hot center, which speeds the whole process. A well-turned pile can produce finished compost in as little as two months.

If you don't want to turn, you don't have to. Passive composting takes longer—four to six months or more—but requires no work after the initial layering. Some gardeners use a three-bin system: they fill the first bin, let it sit for a month, then turn it into the second bin, then the third. This gives them finished compost in the third bin while they're still filling the first. Choose the method that fits your time and energy.

Know what to add and what to avoid

Safe to add: vegetable and fruit scraps, coffee grounds and tea bags, grass clippings, plant trimmings, fallen leaves, straw, shredded newspaper and cardboard (no glossy pages), wood chips, sawdust, and manure from herbivores. Eggshells take longer to break down but are fine. Citrus peels and onion skins are safe but can slow decomposition slightly.

Never add: meat, fish, bones, dairy products, oils, fats, diseased plants, weeds with seeds, pet waste, or treated wood. Meat and dairy attract rats and raccoons. Diseased plants spread illness to your garden. Pet waste contains harmful bacteria. Treated wood contains chemicals. Weeds with mature seeds may survive the pile and spread in your garden. If you're unsure about something, leave it out—there's always plenty of material to compost.

Recognize finished compost and use it

Finished compost is dark brown or black, crumbly, and smells earthy like soil. You should not be able to identify the original materials—they've broken down completely. If you still see leaves, cardboard, or food scraps, the pile needs more time. Sift finished compost through a ½-inch screen or hardware cloth to remove larger pieces; return those pieces to the pile to finish decomposing.

Use finished compost in vegetable gardens, flower beds, potted plants, and lawns. Mix it into the top 4 to 6 inches of soil, or use it as a mulch layer on top. You can also brew compost tea by soaking finished compost in water for 24 hours, then straining and using the liquid to water plants. Most home composters produce enough finished compost in a year to amend a small garden or several large pots.

Troubleshoot common problems

Pile smells like ammonia: This means too much nitrogen (green material) and not enough oxygen. Add brown material and turn the pile. Pile smells like rotten eggs: Same problem—add browns and turn. Pile attracts flies or rodents: You're adding meat, dairy, or not burying food scraps deep enough under brown material. Stop adding those items and bury scraps under 6 inches of leaves or paper. Pile isn't heating up or decomposing: It may be too small, too dry, or have too much brown material. Make sure it's at least 3 feet on each side, water it, and add more green material.

Pile is wet and slimy: It's waterlogged. Add brown material, turn it, and cover the top with a tarp during rain. Finished compost has white fuzzy growth: That's beneficial mold—it's breaking down the material. It's harmless and will disappear as decomposition finishes. Compost takes too long: Turn it more often, chop materials smaller, and maintain the 3-to-1 brown-to-green ratio. If you're adding mostly leaves, add more green material to speed things up.

Frequently Asked Questions

Can I compost in winter?

Yes, but decomposition slows dramatically in cold weather because microbes work more slowly. A pile started in fall may not finish until spring. In mild climates, winter composting works fine. In cold climates, keep adding materials through fall, then let the pile sit undisturbed over winter and turn it in spring when temperatures rise.

How long does it really take to get finished compost?

If you turn the pile every two to four weeks and maintain the right moisture and brown-to-green ratio, you'll have finished compost in two to three months. If you don't turn it, expect four to six months or longer. Smaller pieces decompose faster than whole leaves or branches, so shredding materials cuts time in half.

Do I need to buy a compost bin or can I just use a pile?

A pile works fine and costs nothing. The main drawbacks are that it takes up more space, looks less tidy, and may attract rodents. A bin keeps rodents out, looks neater, and takes up less space. For most home cooks, a straightforward wooden bin or plastic bin with ventilation holes is worth the small investment.

What if I don't have a yard?

You can compost indoors using a small bin with a tight lid and a carbon filter, or using a worm bin (vermicomposting). Worm bins are compact, odor-free when maintained correctly, and produce finished compost in three to six months. They work well in apartments, basements, or garages.

Can I add cooked food to compost?

Cooked vegetables are fine, but cooked food with oils, butter, or meat should not be added—they attract pests and decompose slowly. Stick to raw vegetable and fruit scraps, coffee grounds, and eggshells for the safest, fastest results.