A backyard compost bin is the single best investment a vegetable gardener can make. It diverts a third of household waste from landfill, gives you free soil improver, and saves $40+ a year on potting mix. The right bin is bigger than you think, has good airflow, and has a critter-proof design if you have rats or possums in the area.
Our team’s top picks
FCMP Outdoor IM4000 Tumbler
- Dual-chamber 70 L
- Aerated panels
- Galvanised frame
- Critter-resistant
GeoBin 246-Gallon Composter
- Expandable plastic mesh
- Honest value at the price
- Big capacity
- Easy assembly
Joraform JK270 Insulated Composter
- Insulated for hot composting year-round
- Dual chambers
- Rodent-proof
- Swedish engineering
Aerobin 400L Insulated Composter
- Patented aeration core
- Insulated walls keep heat
- Bottom hatch for finished compost
- Aussie design
Greenes Fence Cedar 3-Bin Composter
- Three-bay timber bin
- Real cedar
- Looks great in a permaculture garden
- For high-volume composters
What to look for in a compost bin backyard garden
- Volume matters: 220 L is the practical minimum for a household of 2-3.
- Black plastic heats fastest in cool climates; recycled-plastic dalek bins work well in warm.
- Look for a bottom hatch for finished compost — saves shovelling from the top.
- Critter resistance: rats are the real test. Vented sides with under-7mm gaps stop them.
- Two-bin systems make sense once you produce more than one bin can handle.
Frequently asked questions
How long does compost take?
Hot composting in an insulated bin: 6-10 weeks. Cold composting in a regular bin: 6-12 months. Either works; the difference is mainly speed.
What can I put in a compost bin?
Fruit and vegetable scraps, coffee grounds, eggshells, garden trimmings, dead leaves, shredded paper, lawn clippings. Avoid meat, dairy, citrus in volume, and pet waste.
Why does my compost smell?
Too wet and too much nitrogen (kitchen scraps) versus carbon (leaves, paper). Add dry browns and turn the heap. A balanced compost heap smells earthy, not sour.
Tumbler or bin?
Tumblers are faster and tidier in suburban gardens. Open bins handle larger volumes and need less effort. We use a tumbler for kitchen waste and an open bin for garden waste.
Bottom line
If you only take one thing from this guide, it is that quality matters more than spec on paper. The picks above have been chosen because our team uses them or trusts them — not because they are the most expensive or have the flashiest marketing. Buy once, garden often.
