How to Set Up a Backyard Compost Bin

Choosing a bin type

The most common backyard composting containers in Canada fall into three broad categories: open-bottomed plastic bins, tumbler drums, and open pile systems enclosed by wooden or wire frames. Each has trade-offs in terms of cost, speed, and how much management they require through the year.

A standard black plastic compost bin. Many Canadian municipalities offered subsidized bins of this type through regional waste diversion programs. Photo: Snowmanradio, CC BY-SA 3.0, via Wikimedia Commons.

Plastic enclosed bins retain heat and moisture reasonably well and require minimal space. They work best for households producing moderate quantities of kitchen scraps and garden trimmings. The trade-off is limited airflow compared to open designs, which can slow decomposition in wetter conditions.

Tumbler designs elevate the bin off the ground and allow spinning, which speeds aeration. They are easier to keep rodent-resistant and can be turned without a pitchfork. However, they hold smaller volumes and can dry out faster in hot or windy conditions.

Open pile systems using wooden pallets, wire mesh cylinders, or lumber frames allow larger volumes and easier turning with a fork. They are better suited to properties generating significant yard waste — leaves, spent vegetable plants, grass clippings — and require more active management to prevent drying or compaction.

Selecting a location

The bin should be placed on bare soil or grass rather than pavement, which allows drainage and gives worms and soil organisms access to the pile. A shaded or semi-shaded spot reduces drying in summer, though too much shade and dense tree roots can slow decomposition.

For practical access, position the bin within easy reach of both the kitchen door and the area where compost will eventually be used. Carrying kitchen scraps far across a yard in winter discourages consistent use. A distance of 10 to 20 metres from the house typically balances accessibility with reasonable separation from living spaces.

Avoid placing bins directly against wooden fences or structures, as the moisture and heat of an active pile can cause rot over time. A gap of 30 to 45 cm between the bin and any structure is a reasonable buffer.

What to add

Compost bins receive two types of organic material, commonly referred to as browns and greens. The balance between these two categories is the primary variable affecting decomposition speed and whether a pile develops unpleasant odours.

Brown materials (carbon-rich)

• Dried autumn leaves
• Cardboard torn into small pieces (remove tape and staples)
• Straw and dried hay
• Shredded newspaper (black ink only)
• Dried plant stalks
• Wood chips and sawdust from untreated wood
• Paper bags and paper towels

Green materials (nitrogen-rich)

• Vegetable and fruit scraps
• Coffee grounds and paper filters
• Tea bags (if paper-based, not synthetic mesh)
• Fresh grass clippings
• Fresh garden trimmings and spent plants
• Eggshells (technically neutral, but a useful addition)

What to keep out

• Meat, fish, and bones (attract wildlife; create odour)
• Dairy products and fats
• Diseased plant material
• Weed seeds and invasive plant species
• Pet waste (cat and dog feces carry pathogens)
• Treated or pressure-treated wood products
• Heavily coated or laminated paper

Layering and initial setup

Starting a bin well makes consistent management much easier. Begin with a 10 to 15 cm base layer of coarse material — wood chips, straw, or small twigs — to create airflow at the bottom of the pile and help with drainage.

From there, alternate layers of brown and green materials. A reasonable working ratio is roughly two to three parts brown material by volume for every one part green material. This approximates the carbon-to-nitrogen ratio that aerobic decomposers prefer.

After adding food scraps, covering them with a layer of brown material reduces odour and discourages flies. This simple habit — burying food scraps rather than leaving them on top — makes a noticeable difference in keeping the bin clean and pest-resistant.

Moisture management

An active compost pile needs consistent moisture. The standard description is the feel of a wrung-out sponge — damp when squeezed, but not dripping. In Canada's variable climate, moisture levels may need active monitoring.

In dry summer months, particularly in prairie provinces and interior British Columbia, piles can lose moisture rapidly. Watering the pile when adding dry materials and covering it with a lid or tarp during hot weather helps maintain moisture levels. In wet coastal regions or during wet springs, adding extra carbon materials to absorb excess water prevents the pile from becoming waterlogged and anaerobic.

First turns

After four to six weeks from initial setup, the pile should be showing signs of activity — reduced volume, warmth in the core, and a shift in colour toward darker brown. This is a good point for the first turn.

Turning moves material from the cooler outer edges into the hotter core and reintroduces oxygen. For a standard enclosed bin, a compost fork works well. For open pile systems, a pitchfork or broad garden fork is more practical for moving larger volumes.

After turning, if the pile seems dry, add water while turning. If it smells sharp or ammonia-like, the balance has likely shifted toward too much nitrogen — add more carbon material (dried leaves, cardboard) and turn again.

Expected timelines in Canada

In active management — regular turning, correct moisture, balanced inputs — a bin can produce usable compost in three to six months during warm weather. In a passively managed system with infrequent turning, the same volume of material may take one to two years to fully mature.

Winter in most Canadian regions effectively pauses active decomposition. The pile freezes and microbial activity drops close to zero. Continuing to add kitchen scraps through winter is fine — the material will begin decomposing again in spring. Some gardeners keep a small insulated container in an unheated garage or shed as a buffer for kitchen scraps during the coldest months.

For further reading on composting standards in Canada, the Environment and Climate Change Canada website provides background on organic waste diversion at the federal level, and most provincial environment ministries publish composting guidance relevant to local conditions.