How to Start a Compost Pile
Composting turns kitchen scraps and yard trimmings into dark, crumbly organic matter that feeds your garden and keeps waste out of the landfill. Starting a pile is simpler than most people expect, and once you understand the basic recipe you can build one in an afternoon.
Pick a level, well-drained spot in part shade, ideally close enough to the kitchen that you will actually walk out to it in bad weather. A three-foot-by-three-foot area is a good target because a pile roughly that size holds heat well while still letting air reach the middle. You can compost in a simple open heap, a wire or pallet bin, or a store-bought tumbler; the container matters far less than what goes inside it and how often you turn it.
The whole thing comes down to balancing two ingredients. "Browns" are dry, carbon-rich materials like fallen leaves, straw, shredded cardboard, and small wood chips. "Greens" are moist, nitrogen-rich materials like grass clippings, vegetable and fruit scraps, coffee grounds, and spent plants. A rough rule of thumb is to use more browns than greens by volume, somewhere around two or three parts brown to one part green, which keeps the pile from turning slimy or smelly.
Build it in layers like a lasagna. Start with a few inches of coarse browns on the bottom to let air circulate, then alternate thinner layers of greens and browns as material accumulates. Chop or shred bulky items so they break down faster, and always toss a layer of browns over fresh food scraps to discourage flies and odor. If you have a shovelful of finished compost or garden soil, sprinkle some in now and then to introduce the microbes that do the real work.
Moisture and air are the two things people most often get wrong. The pile should feel like a wrung-out sponge, damp but not dripping, so water it during dry spells and add extra browns if it gets soggy. Turning the pile with a fork or compost aerator every week or two mixes in oxygen and speeds decomposition; a pile that heats up in the center and then cools is telling you it is ready to be turned again.
Keep a few things out of the bin. Skip meat, fish, dairy, greasy food, and pet waste, since these draw pests and can carry pathogens, and avoid adding weeds that have gone to seed or plants showing obvious disease unless your pile gets hot enough to break them down reliably. Sticking to plant scraps, yard trimmings, and paper products gives you a cleaner, safer result with far less trouble.
Give it time and let the pile tell you when it is done. Depending on your climate, how finely you chopped the materials, and how often you turn it, finished compost can take anywhere from a couple of months to a year. You will know it is ready when it looks dark and crumbly, smells earthy rather than sour, and you can no longer recognize the original scraps; at that point screen out any large chunks, toss them back in the new pile, and work the finished compost into garden beds or use it as a top dressing.
Frequently asked questions
Do I need a bin, or can I just make a pile on the ground?
An open pile on bare ground works perfectly well and lets worms and soil microbes move up into it. A bin mostly helps keep the heap tidy, hold in heat and moisture, and deter animals, so choose one if appearance or critters are a concern, but it is not required to make good compost.
Why does my compost smell bad?
A sour or ammonia smell almost always means the pile is too wet or has too many greens, which cuts off oxygen. Mix in more dry browns like shredded leaves or cardboard, turn the pile to add air, and cover fresh food scraps; the odor usually clears up within a few days.
Can I compost through the winter?
Yes. Decomposition slows way down or stops when the pile freezes, but it starts right back up as things warm in spring. Keep adding scraps all winter, layering in browns as you go, and just plan to turn and finish the pile once the weather breaks.
General guidance for US home gardens. Conditions vary by region and season; check with your local Cooperative Extension office for site-specific advice. Page updated Aug 4, 2026.