Choose a location and container type first

Pick a spot in your yard that gets partial shade and drains well — a corner against a fence or under a tree works best. Full sun speeds decomposition but can dry out the pile too fast; full shade slows it down. Avoid placing the bin directly against your house or where water pools after rain.

You have three main container options. A wooden bin (made from untreated wood or pallets) costs little and lets air flow freely, but rots after a few years. A plastic tumbler (a sealed drum on a stand or rolling base) keeps pests out and lets you turn the pile by rotating it, but holds less material and costs $50 to $150. A wire or mesh bin is cheap and straightforward but offers no pest protection. You can also pile compost directly on the ground with no container at all, though this attracts more rodents.

Key Takeaways

  • Start with a 3-foot by 3-foot space in partial shade with good drainage, away from your house foundation.
  • Layer brown materials (dry leaves, shredded paper, straw) and green materials (grass clippings, food scraps, plant trimmings) in roughly equal amounts by weight.
  • Keep the pile as moist as a wrung-out sponge and turn it every one to two weeks if you want finished compost in two to three months, or leave it undisturbed for six to twelve months.
  • Never add meat, dairy, oils, pet waste, or diseased plants, as these slow decomposition or create odor and pest problems.
  • Finished compost looks dark brown, crumbly, and earthy-smelling, with no recognizable food scraps or leaves remaining.

Gather the right materials to layer

Brown materials are dry and carbon-rich: fallen leaves, shredded newspaper or cardboard, straw, wood chips, and sawdust. Green materials are wet and nitrogen-rich: grass clippings, vegetable and fruit scraps, coffee grounds, plant trimmings, and fresh manure from herbivores (horse or cow, not dog or cat). Aim for roughly equal amounts by weight — if your pile smells like ammonia or looks slimy, you have too many greens; if it barely breaks down after months, you have too many browns.

Chop or shred larger items before adding them. Whole leaves take months to break down; shredded leaves decompose in weeks. Cut vegetable scraps into pieces smaller than your thumb. Tear cardboard into strips. The smaller the pieces, the faster microbes can work.

Build and maintain the pile correctly

Start with a 4- to 6-inch layer of brown material on the ground — this lets air flow underneath. Add a 4- to 6-inch layer of green material, then alternate brown and green until the pile is 3 to 4 feet tall. Water each layer as you go until it feels like a wrung-out sponge, not soggy. The pile should feel damp to the touch but not drip water.

Check moisture once a week. If the pile dries out, water it. If it smells like ammonia or looks wet and matted, turn it and add more brown material. Temperature inside the pile will climb to 130 to 150 degrees Fahrenheit within a few days if conditions are right — this is normal and means decomposition is happening fast.

Turn the pile to speed up decomposition

Turning the pile every one to two weeks mixes materials, adds oxygen, and cuts decomposition time from six to twelve months down to two to three months. Use a garden fork or shovel to move material from the outside (cooler, less decomposed) to the center (hotter, more active). Wear gloves and avoid breathing dust.

If you do not want to turn the pile, leave it alone and wait. It will still decompose — just more slowly. This passive composting method requires no work but takes six to twelve months. Many home gardeners use this approach because it fits their schedule better.

Know what to add and what to avoid

Safe to add: vegetable and fruit scraps, coffee grounds and tea bags, grass clippings, plant trimmings, leaves, straw, hay, shredded paper and cardboard, wood chips, sawdust, and manure from horses or cows.

Never add: meat, fish, bones, dairy, oils or fats, pet waste, diseased plants, weeds with seeds, or glossy or colored paper. Meat and dairy attract rats and raccoons. Pet waste carries parasites. Diseased plants spread illness to your garden. Weeds with seeds will sprout when you use the finished compost.

Recognize when compost is ready to use

Finished compost is dark brown or black, crumbly, and smells earthy — like soil after rain. You should not see recognizable food scraps, leaves, or other original materials. If you squeeze a handful, it should hold together briefly then fall apart, not stay in a tight ball.

If your pile is only partially decomposed, screen out the finished material with a wire mesh and return larger chunks to the pile to break down further. You can use partially finished compost as mulch around plants, though it will continue to decompose and may tie up nitrogen as it does.

Troubleshoot common problems

Pile smells like ammonia or rotten eggs: Too many greens or too wet. Turn the pile and add brown material (leaves, cardboard, straw). Reduce watering.

Pile is not heating up or breaking down: Too many browns or too dry. Add green material (grass clippings, food scraps) and water thoroughly. Make sure pieces are small enough.

Rats or raccoons are digging in: You are adding meat, dairy, or oils. Stop when ready. Bury food scraps under at least 8 inches of brown material. Consider a closed plastic tumbler instead of an open bin.

Pile is attracting flies: Food scraps are exposed. Bury them under brown material. Keep the pile moist but not waterlogged.

Frequently Asked Questions

How long does it take to get finished compost?

Two to three months if you turn the pile every one to two weeks and keep conditions right (moist, balanced materials, small pieces). Six to twelve months if you leave it undisturbed. Temperature, moisture, and how finely you chop materials all affect speed.

Can I add sawdust from treated wood?

No. Treated wood contains chemicals that persist in compost and can harm plants. Use only sawdust from untreated wood, or skip it and use leaves or straw instead.

What if my compost pile freezes in winter?

Decomposition slows dramatically in cold weather but does not stop. Keep adding materials if you want, or wait until spring to restart. The pile will thaw and resume breaking down when temperatures rise.

Do I need to add compost starter or microbes?

No. Soil, leaves, and grass clippings already contain billions of microbes. Commercial starters are not necessary and offer no real advantage over starting with materials from your yard.

Can I compost in a small apartment balcony?

Yes, but only with a sealed plastic tumbler or worm bin, not an open pile. Open piles attract pests and smell in close quarters. A small tumbler (about 3 feet tall) works on a balcony if you keep it moist and turn it regularly.