Greenhouse Horticulture — Canada

Year-Round Growing in a Canadian Greenhouse

From structure selection and heating systems to soil media and seasonal crop schedules — a practical reference for growers across Canada's climate zones.

Covering Zones 3 through 8 — Updated June 2026
Rooftop greenhouse at Lufa Farms, Montreal, Quebec

Featured Articles

Greenhouse Growing, Start to Finish

Three topic areas that cover what most growers need to know before and after their first growing season.

Biology greenhouse at the University of Waterloo, Ontario

Structure & Design

Choosing the Right Greenhouse Structure for Canadian Climates

Hoop houses, Gothic arch frames, and gutter-connected commercial ranges each perform differently under Canadian snow loads and temperature swings.

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Interior view of a greenhouse with rows of plants

Climate Control

Heating, Ventilation, and Climate Control in Canadian Greenhouses

Radiant hot water, unit heaters, and passive solar design each carry different cost profiles and reliability characteristics through a Canadian winter.

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Greenhouse interior at UBC Botanical Garden, Vancouver, British Columbia

Growing Media & Crops

Soil, Growing Media, and Crop Planning for Year-Round Harvests

What to grow in which season, how to structure a soilless mix, and how to plan successions so harvests continue without a gap.

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Why Greenhouses in Canada

Growing Conditions, Extended

Canada's short outdoor season — as few as 90 frost-free days in many regions — makes protected cultivation a practical necessity for consistent fresh produce.

Climate Zone Diversity

From coastal British Columbia (Zone 8) to the Prairies (Zones 2–4) and Quebec’s inland valleys (Zone 5), greenhouse design adapts to regional conditions rather than following a single national standard.

Season Extension vs. Year-Round

Season extension adds four to eight weeks to the outdoor growing window with minimal heating. True year-round production requires consistent heat, supplemental light, and a ventilation strategy that handles both January cold and July heat.

Structure Type Determines Cost

A basic Quonset hoop house with single-layer poly can be assembled for a fraction of the cost of a glass or twin-wall polycarbonate range. Each comes with distinct trade-offs in heat retention, light transmission, and expected lifespan.

Heating Dominates Operating Cost

For most Canadian growers, heating accounts for the largest portion of annual greenhouse operating costs. Fuel choice, insulation quality, and greenhouse orientation together determine whether a winter harvest is financially viable.

Crop Selection Matters

Not every crop is suited to greenhouse economics. High-value crops — tomatoes, cucumbers, peppers, and culinary herbs — typically justify the input costs. Leafy greens produce faster turns and require less vertical space.

Regulatory and Permitting Considerations

Greenhouse construction in Canada falls under provincial building codes. Heated structures generally require a permit. Setback requirements, foundation type, and utility connections vary by municipality.

Quick Reference

Common Questions

What is the best glazing material for a cold climate?

Twin-wall polycarbonate (16 mm or thicker) offers a reasonable balance of light transmission and insulation value for most Canadian climates. Double-layer polyethylene with an air inflation system is widely used in commercial operations for its lower cost and acceptable heat retention.

How much does it cost to heat a small greenhouse through a Canadian winter?

Heating costs depend heavily on greenhouse size, insulation, location, and fuel source. Natural gas is generally the most cost-effective for larger structures; propane is accessible in rural areas but more expensive per BTU. Passive solar design and proper thermal curtains reduce consumption considerably.

Do I need a permit to build a greenhouse in Canada?

Permit requirements vary by province and municipality. Permanent structures with a foundation or utility connections almost always require a building permit. Temporary hoop houses under a specific footprint threshold may be exempt in some jurisdictions. Always check with your local municipality before construction begins.

What crops grow well in a Canadian greenhouse year-round?

Leaf lettuce, spinach, arugula, Swiss chard, and culinary herbs (basil, parsley, cilantro) grow quickly and tolerate lower light conditions typical of winter months. Tomatoes, cucumbers, and peppers require more heat and ideally supplemental lighting for productive winter yields.