Pick a location and gather your materials

A compost heap works best in a spot that gets partial shade—direct sun dries it out too fast, and deep shade slows decomposition. Choose a level patch of bare ground where water can drain away, not a low spot that collects standing water. If you have the space, pick a corner away from the house so you won't notice fruit flies or smell during warm months.

You do not need to buy anything to start. A straightforward heap is just a pile of organic material on the ground. If you want to contain it, you can build a three-sided bin from untreated wood pallets, stack concrete blocks, or buy a plastic bin with a lid. The bin keeps animals out and the pile neat, but it is not required. A free-standing heap works fine and takes up less space to build.

Gather two types of material before you start: brown materials (dry leaves, shredded paper, cardboard, straw, wood chips) and green materials (grass clippings, vegetable scraps, coffee grounds, fresh plant trimmings). You do not need to have everything on hand—you will add to the pile over weeks and months. Start with whatever you have.

Key Takeaways

  • A compost heap needs partial shade, level ground, and a mix of brown (dry) and green (wet) materials in roughly equal amounts by volume.
  • You can start with a straightforward pile on bare ground or build a bin from pallets or blocks to keep it contained and tidy.
  • Layer brown and green materials as you add them, and turn the pile every two to four weeks to speed decomposition.
  • A working heap should feel like a wrung-out sponge—damp but not soggy—and smell earthy, not rotten.
  • Finished compost is dark, crumbly, and ready to use in about three to six months, depending on how often you turn it.

Build your first layers

Start on bare ground so worms and microorganisms can move up into the pile. Lay down a 4-inch layer of brown material—shredded leaves or cardboard work well. This base layer lets air flow underneath. Then add a 4-inch layer of green material: grass clippings, vegetable scraps, or plant trimmings. Alternate brown and green as you add material, keeping the layers roughly equal in volume.

Do not pack the layers down. A loose pile lets air move through it, which speeds decomposition and prevents the heap from turning into a wet, smelly mess. If you are using a bin, fill it until it is about three-quarters full, then stop adding and let it break down for a few weeks before you add more.

Water and turn the pile

The heap should feel like a wrung-out sponge—damp throughout but not dripping wet. If it looks dry, water it with a hose until moisture shows at the bottom. If it smells like rotten eggs or ammonia, it is too wet; add more brown material and turn it to let air in.

Turn the pile every two to four weeks by moving material from the outside edges to the center with a pitchfork or shovel. The center heats up as microbes break down the material, and turning moves cooler outside material into that hot zone. This speeds decomposition from six months down to three. If you do not turn it, the pile will still break down—it just takes longer, usually six to twelve months.

Do not turn it more than once a week. Frequent turning cools the pile and can slow the process. Every two to four weeks is the sweet spot for most home heaps.

What to add and what to avoid

Safe to add: vegetable and fruit scraps, coffee grounds and tea bags, grass clippings, leaves, shredded paper and cardboard, straw, wood chips, plant trimmings, and crushed eggshells. These break down quickly and feed the microbes that do the work.

Do not add: meat, fish, dairy, oils, or fats—they attract rats and raccoons and create foul smells. Avoid diseased plants, weeds with seeds, and pet waste. Do not add glossy or colored paper, which may contain chemicals. Grass clippings from lawns treated with herbicides or pesticides should stay out too, since those chemicals can persist in the finished compost.

Shred or chop large pieces before adding them. A whole apple takes months to break down; chopped apple pieces decompose in weeks. The smaller the pieces, the faster the process.

Recognize when compost is ready

Finished compost is dark brown or black, crumbly, and smells earthy—like forest soil. You should not be able to recognize the original materials. If you can still see leaves or cardboard, it is not ready yet. Let it sit for another few weeks.

You do not have to wait for the entire pile to finish. You can harvest finished compost from the bottom of the heap while the top is still breaking down. Dig out the dark, crumbly material and use it in garden beds, potted plants, or mixed into lawn soil. The material above will settle down and continue decomposing.

Troubleshoot common problems

If the pile smells like ammonia or rotten eggs, it is too wet or has too much green material. Add shredded leaves or cardboard, turn it thoroughly, and let it dry out for a few days. If it is not heating up or breaking down after several weeks, it probably needs more green material or more frequent turning. Add fresh grass clippings or vegetable scraps and turn it again.

If you see rats or raccoons, you added meat, dairy, or oil—remove those materials and bury new scraps deeper in the pile. Cover the top with a layer of brown material to hide food scraps from sight. If flies are a problem, bury green materials under brown material instead of leaving them on top, and keep the pile damp but not wet.

If the pile is not breaking down at all after two months, the material may be too coarse. Chop or shred what you have, turn it, and add finer materials like grass clippings or coffee grounds to speed things up.

Frequently Asked Questions

How long does it take to get usable compost?

Three to six months if you turn the pile every two to four weeks. If you do not turn it, expect six to twelve months. The speed depends on temperature, moisture, material size, and how often you turn it. Warm weather speeds decomposition; cold weather slows it down.

Can I use compost that still has some chunks in it?

Yes. Compost does not have to be perfectly uniform. If most of it is dark and crumbly but a few pieces are still visible, you can use it in garden beds or potted plants. The remaining chunks will break down further in the soil.

Do I need to add compost starter or special bacteria?

No. Soil, leaves, and grass clippings already contain the microbes and fungi that break down organic material. A commercial starter is not necessary and will not speed up the process significantly. Save your money.

What if I do not have brown materials?

Shredded newspaper, cardboard, or paper bags work well. You can also ask a tree service for wood chips or visit a local park after leaf fall and bag up leaves. If you are stuck, you can start with mostly green material, but the pile will be wetter and slower—add brown material as soon as you can get it.

Can I add sawdust or wood shavings?

Yes, but only from untreated wood. Sawdust from pressure-treated lumber or plywood contains chemicals that will end up in your finished compost. Plain wood shavings from a hardware store or tree trimmer are safe to use.