Does a Compost Bin Need a Bottom?

Maybe. It depends on a few things like climate, location of the bin and if you need to deter critters. Read on to find out if your compost bin needs a bottom.

Related To:

Recycled Plastic Compost Bin

Compact Composter

Perfect for small yards, this composter features a modest foot print at 27 inches square. The bin stands 40 inches high, with a built-in lid that won’t blow away even during high wind events. Recycled plastic is UV-resistant, and built-in air holes allow air to reach developing compost.

Photo by: Gardener’s Supply Company at

Gardener’s Supply Company at

A compost pile is full of living organisms: ones you can see, like earthworms and millipedes, and ones you cannot see, like bacteria and fungus. All of these organisms work together to turn garden and kitchen waste into a biologically active, rich soil additive — black gold, as most gardeners call it.

When you first start composting, it’s easy to get bogged down with all the details. Where should you put a compost bin? Should you cover a compost pile? Does a compost bin need a bottom? How do you keep wildlife out of your compost? Here are some answers to help solve your questions about compost.

The Best Place For a Compost Bin

Build your compost pile in the place that makes the most sense. The composting process happens in sun or shade (think of the forest floor — lots of composting happens there), although the process occurs more quickly in a sunny spot. Compost in the sun also tends to dry out more, so you may need to moisten the pile more often.

Many times gardeners relegate the compost pile to a back corner of their lot, mainly because of aesthetics. A compost pile isn’t the prettiest addition to your landscape. But you might consider siting it near where you’ll use it most. For instance, if your compost winds up on your veggie garden, place the pile near that growing area so you won’t have to haul the finished compost as far.

Does a Compost Bin Need a Bottom?

If you’re building your compost bin from scratch, you don’t usually need to add a bottom to it. Having composting materials sit directly on soil allows microorganisms, worms and insects — creatures that facilitate the composting process — to move from soil into compost.

As materials break down, they release moisture. Not having a solid base also means that moisture can drain freely from the pile. If excess moisture can’t drain, a compost pile can become waterlogged, which kills beneficial organisms and bacteria and creates a foul odor.

A solid bottom on a compost bin makes it somewhat easier to remove finished compost. But you can also scoop finished compost out of a pile sitting directly on soil — it just might require back-bending or kneeling.

Manufactured compost bins and tumblers include a solid bottom that usually has drainage holes. If a bottom comes with your composter, definitely use it. If you’re building a pile from scratch, place it directly on soil or lawn, and expect great results. If your compost bin needs to go on a hard surface, build a raised bed to place the bin on, so you have a way to catch drainage.

Many experienced gardeners start a compost pile with a layer of branches and sticks piled a few inches high. This helps elevate the pile and allows airflow beneath composting materials. Source branches from local tree trimmers or a yard waste drop-off site. Or save spent holiday evergreens for a foundation for future piles.

How to Keep Critters Out of Compost

One reason that gardeners like to have a bottom on a compost bin is to exclude critters like mice, voles, shrews and other small animals. These creatures dig into compost to feast on kitchen scraps or plant matter. In cold-winter zones, small animals may burrow into the pile to snuggle up in the warmth. In spring, these animals typically exit the pile.

To prevent animals from tunneling into a bottomless compost bin, line the base with hardware cloth or chicken wire. Use a material with the smallest openings you can find to keep the most critters from gaining access to your pile.

Next Up

Does a Compost Bin Need Air Holes?

Yes! Good airflow is one of the secrets to successful composting. Without it, your compost pile could turn into a stinky mess (literally). Learn how to increase airflow in your compost pile.

Should I Cover My Compost Pile?

Maybe. It depends on a few things like weather, what type of composter you have and your gardening goals. Read on to find out when you should keep a lid on your compost.

I Keep Worms in My Living Room and Here’s Why

Vermicompost — also known as worm compost — can be a gardener’s best friend, but it is a little pricy. Creating your own worm compost is easy and can save money, and best of all, you can do it anywhere, even in your living room.

The Different Ways to Make Compost

Composting can be more than just throwing food scraps on a pile. Learn a few new methods for making natural fertilizers.

Keyhole Gardening Tips

Try this inexpensive, green solution to growing food in drought-prone terrain.

Will It Compost?

Let's find out, shall we?

Why Compost?

It's not just good for the environment: it's good for the garden!

Compost Crib Notes

Organic fertilizer keeps crops—and the planet—healthy and productive.

25 Things You Can Compost (Some May Surprise You!)

Did you know you can compost hair, dryer lint and nail clippings along with your kitchen scraps? It’s not gross; rather, it helps amp up the quality of your garden soil.

How to Make an Attractive Compost Bin for Your Kitchen

Turn the kitchen scrap bin into a conversation piece instead of an eyesore. A simple wood box with a removable (and dishwasher safe) insert makes it easy to compost.

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