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Composting in Winter: Why It Slows Down and How to Keep It Working
Why compost slows down in winter
Compost heaps work slower in cold weather because microbes and worms become less active. Shorter days and lower temperatures mean less heat is generated, so decomposition naturally slows.
What you can (and can’t) compost in cold weather
- Can add: Fruit and veg scraps, tea bags, coffee grounds, shredded paper, autumn leaves.
- Avoid: Large woody stems (unless chopped), meat, dairy, and cooked food.
- Keep a balance of “greens” (kitchen waste) and “browns” (leaves, shredded paper) for best results.
Insulating your compost heap/bin
- Use a closed compost bin or cover open heaps with old carpet, cardboard, or a tarp to retain heat.
- Heap straw or autumn leaves around the outside for extra insulation.
- Position bins in a sunny, sheltered spot if possible.
Turning and aerating in winter
- Turn compost less often in winter, but aerate gently every few weeks to keep air flowing.
- Use a garden fork or shovel—don’t forget your gardening gloves and garden tubs for moving material.
Using compost activators (when and if needed)
- Activators (like fresh grass clippings or comfrey leaves) can help, but avoid chemical additives unless you stock them.
- Add a sprinkle of soil or finished compost to introduce helpful microbes.
Planning for spring: using winter compost
- Even slow winter composting produces usable material by spring.
- Use finished compost to mulch beds, pot up seedlings, or top-dress lawns.
FAQs
Does composting work in winter?
Yes, but it’s slower—keep adding material and insulate your heap.
Yes, but it’s slower—keep adding material and insulate your heap.
How do I keep my compost heap warm?
Use a closed bin or cover, and add insulating layers of straw or leaves.
Use a closed bin or cover, and add insulating layers of straw or leaves.
What can I add to compost in winter?
Kitchen scraps, shredded paper, autumn leaves, cardboard.
Kitchen scraps, shredded paper, autumn leaves, cardboard.
Should I turn compost in cold weather?
Gently aerate every few weeks—don’t overdo it.
Gently aerate every few weeks—don’t overdo it.
Can I add kitchen scraps in winter?
Yes—mix with “browns” to avoid sogginess.
Yes—mix with “browns” to avoid sogginess.
Why does my compost smell in winter?
Too wet or not enough air—add dry material and turn the heap.
Too wet or not enough air—add dry material and turn the heap.
Can I use compost from winter heaps in spring?
Absolutely—use as mulch or soil improver.
Absolutely—use as mulch or soil improver.
Do I need a compost bin or is a heap okay?
Both work, but bins retain heat better in winter.
Both work, but bins retain heat better in winter.
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