Step 4 - Composting
The Best Compost Tumblers
Fast, enclosed and easy to turn. Just do not expect one to swallow a fall of leaves.
Janet H. - the hands-on owner behind Janet Media Group.
Published - last updated
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Buy a dual-chamber tumbler if you compost kitchen scraps and want usable compost within weeks rather than seasons. Buy an open bin as well if you have a yard that produces leaves -- the two systems handle different material and most gardens genuinely want both.
Quick picks
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 |  Top pickFCMP Outdoor IM4000 Tumbling ComposterDual chamber, roughly 37 gal total | Most backyards | 9.1 | Check price on Amazon |
| 2 |  Envirocycle ComposterTumbler drum on a liquid-collecting base | Patios and small yards | 8.0 | Check price on Amazon |
| 3 |  GEOBIN Expandable Compost BinExpands to roughly 216 gal, 36 in tall | Leaves and yard waste | 8.7 | Check price on Amazon |
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Scores are our own editorial judgment, formed from published specifications and independent sources. They are not aggregated customer ratings, and they are not the result of hands-on testing, which we do not currently do. See how we choose.
Why turning speeds things up
Composting is aerobic: the organisms doing the work need oxygen. A static pile runs out of air in the middle, slows down, and in a wet mix goes anaerobic and sour. Turning reintroduces oxygen and redistributes moisture, and a tumbler makes that a ten-second job rather than a fork exercise.
It also means you actually do it. A pile you are supposed to fork over every fortnight gets forked over twice a year.
The two-chamber argument
A single chamber you keep adding to never finishes. Two chambers let you fill side A, switch to side B, and empty A as finished compost while B fills. In warm weather that gives a steady rhythm of batches rather than a permanent work in progress.
If you buy a single-chamber tumbler, the workaround is discipline: stop adding, let it finish, empty it, start again. That works, but it requires somewhere to put scraps in the meantime.
The capacity ceiling
Thirty-seven gallons across two chambers sounds like a lot until you rake a lawn. Tumblers are sized for kitchen scraps plus modest garden waste, and they are not the answer for autumn leaf fall or regular grass clippings.
| Good for | Not for |
|---|---|
| Kitchen fruit and vegetable scraps | Autumn leaf fall in any quantity |
| Coffee grounds and tea | Regular grass clippings from a large lawn |
| Shredded paper and cardboard | Woody prunings and branches |
| Modest amounts of soft garden waste | Large volumes of anything |
Keeping it working
- Keep browns within reach. A bag of dry leaves or torn cardboard beside the tumbler is the habit that prevents a wet, slimy drum.
- Chop material smaller. Tumblers reward small pieces -- more surface area, faster breakdown, and easier turning.
- Do not overfill. A drum packed to the top cannot tumble. Around three-quarters full is where the material actually moves.
- Watch the moisture. Enclosed drums keep rain out but also keep moisture in. If it is soggy, add browns; if it is dusty, add water.
- Turn a few times a week while a batch is active, and stop turning once it is finishing.
Winter slows everything down -- a tumbler in a cold climate largely stops until spring. If year-round composting matters, a worm bin indoors is the companion system.
For the direct comparison with static bins, see compost bin vs tumbler.
The picks in full
Top pick
FCMP Outdoor IM4000 Tumbling Composter
FCMP Outdoor
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Two chambers is the whole point: you keep adding to one side while the other finishes, so you get a batch out instead of a bin that is never quite ready.
The single-chamber problem is why most first composters give up. You keep adding kitchen scraps to the same bin, so the contents are always part-finished, and you can never take any out.
Two chambers solves it mechanically. Fill side A until it is full, then switch to side B and leave A alone. By the time B is full, A is finished compost you can empty in one go. In warm weather that cycle runs in a matter of weeks.
Understand the capacity limit going in. Around 37 gallons total is generous for kitchen scraps from a household, and small if you also want to compost lawn clippings and autumn leaves. Those belong in an open bin.
What works
- Dual chambers give you a finishing batch and an active batch at once
- Off the ground, so rodents are not the problem they are with an open pile
- Turning is a handle pull rather than a fork job
- Closed drum keeps rain from waterlogging the mix
What does not
- Capacity fills fast if you also compost yard waste
- Heavy to turn when a chamber is full and wet
- Assembly takes longer than the box suggests
Skip it if: you generate a lot of yard waste. A tumbler is volume-limited by design, and a big open pile handles leaves and grass far better.
| Type | Rotating dual-chamber tumbler |
|---|---|
| Capacity | About 37 gal across two chambers |
| Material | UV-resistant recycled polypropylene |
| Aeration | Deep fins and internal mixing bar |
| Assembly | Bolt-together frame and drum |
Patios and small yards
Envirocycle Composter
Envirocycle
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Small, tidy, and the base collects the liquid that drains out -- which is the part people actually want and most tumblers throw away.
Most compost tumblers look like equipment. This one is designed to be tolerable on a patio, and if the reason you have not started composting is that the bins are ugly, that is not a frivolous objection.
The base is the functional difference. Liquid drains out of any active compost and normally disappears into the ground; here it collects, and diluted heavily it is a perfectly good feed for container plants.
It is a single chamber, so you will still hit the part-finished problem. The workaround is to stop adding for a few weeks and let a batch finish, rather than topping it up forever.
What works
- Looks acceptable on a patio, which matters more than it should
- Collects the liquid runoff instead of losing it
- Very little assembly
- Single unit, easy to roll and turn
What does not
- Single chamber, so the never-finished problem returns
- Small capacity
- Priced high for the volume you get
Skip it if: you want volume. This is a patio-scale machine and it will not keep up with a productive vegetable garden.
| Type | Rotating drum on a collection base |
|---|---|
| Capacity | Around 35 gal on the full-size model |
| Material | Recycled food-grade plastic |
| Liquid | Base collects drainage for dilution |
| Assembly | Drum lifts onto the base, no tools |
Leaves and yard waste
GEOBIN Expandable Compost Bin
GEOBIN
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Barely a product -- a sheet of perforated plastic you roll into a circle -- and by far the most volume per dollar in composting.
If your composting problem is autumn leaves and grass clippings rather than kitchen scraps, this is the answer and a tumbler is not. Volume is what yard waste needs, and 216 gallons of volume costs less here than 40 gallons costs anywhere else.
The adjustable diameter is genuinely useful: start it small so the pile stays deep enough to heat, and expand it as the material accumulates.
Keep cooked food, meat and dairy out. An open bin with no floor is accessible to every rodent in the neighborhood, and the standard advice on that is not squeamishness, it is experience.
What works
- Enormous capacity for the money
- Adjustable diameter -- start small, expand as you fill it
- Perforations give good airflow through the pile
- Unclips and stores flat
What does not
- No lid, so heavy rain waterlogs it
- No rodent protection whatsoever
- Turning it means a fork and some effort
Skip it if: you are composting cooked food or meat. An open bin is an open invitation, and this one has no lid and no floor.
| Type | Open expandable bin |
|---|---|
| Capacity | Up to about 216 gal depending on diameter |
| Height | 36 in |
| Material | Perforated recycled plastic sheet |
| Assembly | Roll and clip, under five minutes |
Common questions
Are compost tumblers better than compost bins?
For speed and for keeping rodents out, yes. For volume, no -- tumblers hold a fraction of what an open bin does and cannot handle leaf fall or regular grass clippings. Many gardens want both: a tumbler for kitchen scraps and an open bin for yard waste.
How often should you turn a compost tumbler?
A few times a week while a batch is actively breaking down. Once a chamber is finishing, stop turning and let it mature. Turning reintroduces oxygen, which is what the decomposing organisms need and what a static pile runs short of.
Why is my compost tumbler wet and slimy?
Too many greens and not enough air. Wet nitrogen-rich material packs down and goes anaerobic. Add a generous quantity of dry browns -- leaves, torn cardboard, shredded paper -- tumble thoroughly, and it usually recovers within a few days.
Can you put grass clippings in a compost tumbler?
In small amounts mixed with plenty of browns, yes. In quantity, no -- fresh clippings are wet and nitrogen-rich, they mat into slimy layers, and a lawn produces far more than a tumbler can absorb. Large volumes belong in an open bin.
Sources
Factual claims on this page are backed by the published sources below, and product specifications are the manufacturers’ own. Where a figure is not published, we say so rather than estimating it.