Cold Composting
Method
Cold composting is a low-effort way to recycle organic materials over time. It works more slowly than hot composting and usually needs less turning and monitoring. Many home gardeners choose it when they want a simple system for routine yard and kitchen waste.
How it works
Organic matter breaks down gradually through the work of fungi, bacteria, and soil organisms. Because the pile is not managed for high heat, decomposition depends more on weather, material size, and natural airflow. Materials are often added as they become available, which creates a slower and less uniform process. Over time, the lower layers break down first and the pile settles.
Details
Use a bin or open pile in a convenient location and add plant trimmings, leaves, and kitchen scraps in thin layers. Cover fresh greens with browns to reduce odors and discourage pests. Turn the pile occasionally if you want to improve airflow, but it can also be left mostly undisturbed. Harvest compost from the oldest, darkest section once it looks crumbly and earthy.
Tips
Patience matters because cold piles can take many months to finish. Smaller pieces decompose faster, so shredding coarse material helps. Keep the pile covered with browns if it becomes wet, slimy, or attractive to pests.
General guidance for US home gardens. For local guidance and any rules on composting, contact your Cooperative Extension office. Page updated Aug 4, 2026.