Agriculture in Ontario Today
Ontario is Canada's most diverse agricultural province. Its southwestern counties enjoy a long growing season and rich soils suited to corn, soybeans and wheat. The Niagara region and Prince Edward County support grapes and tender fruit. Leamington and Kingsville host one of North America's largest concentrations of greenhouse vegetable production. Eastern and central Ontario sustain extensive dairy and beef operations, while the Holland Marsh produces vegetables from uniquely fertile organic soil.
This diversity means Ontario farming companies range from multi-generational family operations of a few hundred acres to vertically integrated enterprises supplying national retailers. What they increasingly share is a technological sophistication that would be unrecognisable to farmers of previous generations, with satellite guidance, variable rate application, climate-controlled growing environments and detailed data on every field.
Top 10 Best Farming Companies in Ontario
1. Mastronardi Produce
Based in Kingsville, Mastronardi is one of North America's largest greenhouse produce companies, known for tomatoes, peppers and cucumbers grown under glass. Its investment in breeding, flavour-focused varieties and controlled environment technology has made Ontario greenhouse produce a year-round presence in Canadian and American grocery stores.
2. Nature Fresh Farms
Another major Leamington greenhouse grower, Nature Fresh Farms combines large-scale production with energy efficiency initiatives and sustainable packaging programs. Greenhouse growing allows precise control of water, nutrients and climate, producing high yields with comparatively low land use.
3. Pioneer Hi-Bred and Ontario Grain Operations
Large grain farming enterprises across southwestern Ontario produce corn, soybeans and wheat at scale, using precision agriculture to manage variability across fields. These operations underpin the province's livestock feed, ethanol and food processing industries.
4. Gay Lea Foods
A farmer-owned dairy co-operative, Gay Lea processes milk from Ontario dairy farms into butter, cheese and cultured products. Co-operative structures give farmers a share in downstream value rather than only commodity milk pricing.
5. Burnbrae Farms
Headquartered in eastern Ontario, Burnbrae is a family-owned egg producer and processor supplying shell eggs and egg products nationally. Its investment in alternative housing systems reflects changing consumer expectations around animal welfare.
6. Highline Mushrooms
Operating substantial Ontario facilities, Highline is among Canada's largest mushroom growers. Mushroom production is a highly controlled indoor process with intensive substrate management and a strong circular element, since spent substrate returns to agriculture as soil amendment.
7. Norfolk County Specialty Crop Growers
Norfolk County produces asparagus, ginseng, apples and a range of specialty crops on sandy soils well suited to horticulture. Growers here have diversified successfully as traditional tobacco production declined.
8. Niagara Vineyard and Fruit Operations
The Niagara Peninsula supports grape growing for a substantial wine industry alongside peaches, cherries and other tender fruit. Microclimate management and careful varietal selection define quality in this region.
9. Holland Marsh Vegetable Growers
The Holland Marsh north of Toronto produces carrots, onions and leafy vegetables from deep organic soils. Its proximity to a major urban market supports both large-scale supply and direct local sales.
10. Ontario Beef and Livestock Enterprises
Cow-calf and feedlot operations across eastern and central Ontario supply the provincial beef sector. Pasture management, feed efficiency and herd genetics are the levers these businesses use to remain competitive.
Technology Transforming Ontario Farms
Precision agriculture is now mainstream. Satellite guidance, yield mapping, soil sampling grids and variable rate fertiliser application allow farmers to treat each part of a field according to its actual needs, improving yields while reducing input waste and nutrient runoff.
Controlled environment agriculture has expanded well beyond traditional greenhouses. Supplemental lighting extends Ontario's growing season through winter, while advanced climate computers manage temperature, humidity and carbon dioxide levels continuously.
Data platforms tie it together. Farm management software tracks field operations, input costs and margins per acre, giving operators the kind of granular business intelligence that was once limited to manufacturing.
Sustainability and Land Stewardship
Soil health has become a central concern. Cover cropping, reduced tillage and diversified rotations rebuild organic matter, improve water retention and reduce erosion. Many Ontario farms have adopted these practices for agronomic reasons as much as environmental ones.
Water management matters especially near the Great Lakes, where nutrient runoff contributes to algal blooms. Buffer strips, controlled drainage and precise nutrient timing help reduce phosphorus loss from fields.
Energy is a significant cost for greenhouse operations, driving investment in combined heat and power, energy curtains and heat recovery systems that lower both expenses and emissions.
Challenges Facing the Sector
Land prices in southern Ontario are high and rising, driven by urban expansion and competition for prime acreage. This makes entry extremely difficult for new farmers and pushes succession planning to the forefront for family operations.
Labour availability remains a persistent constraint, particularly for horticulture, which depends heavily on seasonal workers. Automation is advancing but cannot yet replace skilled hand harvesting for many crops.
Weather volatility adds risk. More frequent extreme rainfall and heat events complicate planting and harvest windows, increasing the value of drainage infrastructure, crop insurance and resilient varieties.
Final Thoughts
Ontario farming combines exceptional natural advantages with genuine technological leadership. The companies profiled here illustrate the range of the sector, from vast greenhouse complexes to co-operatively owned dairy and specialty horticulture. As the province balances urban growth, climate pressure and food security, these businesses will remain central to how Ontario feeds itself and exports to the world.