Wheat, corn and soybeans: how grain markets work for traders

Grain trading means taking a position on the price of wheat, corn (maize) or soybeans, usually through futures listed in Chicago or CFDs priced from them. These are physical crops with a once-a-year growing cycle, so prices are driven less by interest rates and company news and more by weather, planted area, government crop estimates and the politics of food exports. The most important scheduled event is the US Department of Agriculture's monthly WASDE report, and the most important unscheduled ones are droughts, floods and export bans.

If you are new to commodity contracts, read how commodity futures work first. This guide focuses on what is different about grains.

The three main grains and why they matter

Wheat

Wheat is the world's most widely traded food grain. It is grown in many climates and harvested at different times of year in different places, which means there is almost always a harvest happening somewhere. Major exporters include Russia, the European Union, Canada, Australia, the United States, Ukraine and Argentina. Major importers are spread across North Africa, the Middle East and Asia.

Wheat comes in classes. In the US futures market the main ones are soft red winter wheat (the CBOT contract most people mean by "Chicago wheat"), hard red winter wheat (traded on the Kansas City contract) and hard red spring wheat. In Europe the reference is Euronext milling wheat, quoted in euros per tonne.

Corn

Corn is the largest grain crop by volume. Much of it is used as animal feed, and in the United States a large share goes into ethanol, which links corn to fuel policy and, loosely, to energy prices. The United States is the largest producer and a leading exporter, with Brazil, Argentina and Ukraine also major exporters. Because US output is so large, the US growing season from April to October is the period when corn prices are most sensitive to weather.

Soybeans

Soybeans are crushed into soybean meal (protein feed for livestock) and soybean oil (food and biofuel). Brazil and the United States are the biggest producers and exporters, and China is by far the largest importer. That makes soybeans unusually exposed to US–China trade relations and to Brazilian harvest conditions in the southern hemisphere season. Soybean meal and soybean oil have their own futures, and the difference between the value of the products and the beans is known as the crush spread.

Where grain prices come from

The benchmark futures for all three are listed on the Chicago Board of Trade (CBOT), part of CME Group.

• Contract size: 5,000 bushels for wheat, corn and soybeans.
• Quote: US cents per bushel, so a price of 550 means $5.50 a bushel.
• Minimum move: a quarter of a cent, worth $12.50 per 5,000-bushel contract. A full one-cent move is worth $50 per contract.
• Delivery months: the main contracts are spread through the year and follow the crop cycle, for example a new-crop December contract for corn and November for soybeans.

A bushel is a volume measure, so the weight differs by crop: a bushel of wheat or soybeans is 60 pounds, a bushel of corn 56 pounds.

Retail CFDs on grains are typically priced from a specific CBOT contract month. As with other commodities, the CFD may be dated (it expires with the futures month) or rolling (it is moved forward automatically, with an adjustment at each roll). Because grain curves can shift a lot between old-crop and new-crop months, roll adjustments on grain CFDs can be large. The oil trading guide has a worked roll example that works the same way here.

What moves grain prices

Weather

Weather is the dominant driver during the growing season. A hot, dry spell during US corn pollination in July can move prices more than any economic report. Drought in Australia, frost in Russia, excessive rain in Europe or dryness in Argentina and Brazil can all change the supply outlook. Grain traders follow forecast models closely, and prices can move simply because the next two weeks' forecast changed. Large climate patterns such as El Niño and La Niña are watched for their typical effects on rainfall in different regions, although the effects vary from one episode to the next.

Planted area

How many acres or hectares farmers plant sets the upper limit on the crop. In the United States, the USDA's Prospective Plantings report at the end of March gives the first survey-based estimate of planting intentions, and the Acreage report at the end of June updates it with what was actually planted. Both regularly surprise the market. Farmers decide between crops partly on relative prices, so a high soybean price relative to corn can shift acres from one to the other.

Stocks and demand

The ratio of ending stocks to use, meaning how much grain is expected to be left over at the end of the marketing year compared with how much is consumed, is the market's main gauge of tightness. A low ratio leaves little buffer for bad weather, and prices tend to be more volatile. Demand comes from food, animal feed, biofuels and exports. Weekly US export sales data, released on Thursday mornings New York time, show who is buying.

Export policy and geopolitics

Food is political. Governments restrict exports when domestic prices rise, and those decisions can move world prices sharply. The Black Sea region, home to two of the world's largest wheat exporters, Russia and Ukraine, is especially sensitive, as 2022 showed. Sanctions, shipping risks, insurance costs and corridor agreements all affect how much grain reaches the world market.

The dollar and freight

Grain futures are priced in dollars, so a stronger dollar makes US grain less competitive against exports priced in other currencies, while a weaker dollar has the opposite effect. Freight costs affect which origin is cheapest for a given buyer. Both effects are real but usually secondary to crop size.

Energy prices

Corn and soybean oil are used to make biofuels, and fertiliser and diesel are major farming costs. Higher energy prices can therefore support grain prices through both demand and costs, though the relationship is loose and inconsistent.

The WASDE report

The World Agricultural Supply and Demand Estimates (WASDE) report is the USDA's monthly balance sheet for global and US crops: production, use, trade and ending stocks for wheat, corn, soybeans, rice, cotton, sugar and livestock products. It is released at 12:00 New York time (17:00 London time for most of the year), usually between the 8th and 12th of the month. The USDA publishes the full year's dates in advance; in 2026, for example, the remaining releases are on 10 November and 10 December. Always check the official USDA calendar for the current year.

How traders read it:

1. Compare with expectations. News agencies poll analysts before each report. As with economic data, the surprise against the consensus matters more than the number itself. The approach in how to use an economic calendar applies directly.
2. Focus on yields and ending stocks. During the US growing season, changes to estimated yield per acre and to US ending stocks usually draw the biggest reaction.
3. Watch the world numbers too. Changes to estimates for Brazil, Argentina, Russia, the EU or Australia can matter as much as US figures.
4. Expect fast prices. Spreads widen and prices can move several cents in seconds at noon New York time. Some report days, especially the June Acreage and Grain Stocks release and the January annual crop reports, produce particularly large moves.

The USDA's weekly Crop Progress report, published on Monday afternoons during the season, rates the condition of crops in the field and is another regular source of volatility.

The 2022 grain shock

Russia's invasion of Ukraine in February 2022 is the clearest modern example of how fast grain prices can move.

• Late February to early March 2022. With Black Sea ports disrupted, Chicago wheat rose sharply. On 7 March the May CBOT wheat contract settled at its daily limit at $12.94 a bushel, its highest level in about 14 years. The all-time high at the time was $13.49½, set in February 2008.
• Limit moves. For several sessions wheat moved by its full daily limit, meaning that for long stretches there was no trading at any other price, and the band widened under the exchange's expanded-limit rules.
• May 2022. On 14 May India banned most wheat exports after a heatwave hit its crop. When Chicago reopened on 16 May, wheat rose by its daily limit, and Euronext milling wheat reached a record of about €435 a tonne.
• The aftermath. Prices later fell back substantially as Black Sea exports resumed through a UN-brokered shipping arrangement and other supply adjusted, which is a reminder that spikes driven by fear of disruption can reverse quickly.

For a CFD trader the takeaway is that grain markets can move by amounts that ordinary stop-loss distances do not cover, and that a limit-locked futures market can leave a CFD position stuck or gapping.

Daily price limits

CBOT grain futures have daily price limits: the maximum the price can move above or below the previous settlement in one session. The limits are set by the exchange, are reset periodically based on price levels, and can expand after a limit move. When a contract hits its limit and there are no sellers (or buyers) within the band, the market is said to be locked limit-up or limit-down.

This has two consequences for CFD traders:

• Your CFD may stop moving or be quoted only on one side while the underlying futures are locked, because the provider has no reliable price to hedge against.
• The next session can open far away. If the fundamental news justifies a move larger than the limit, the remainder arrives at the next open, past any stop loss you had. The guide to gap and weekend risk explains why stops are filled at the next available price.

Seasonality

Grains have a well-known annual rhythm: planting in spring, weather risk through the northern summer, harvest in autumn, and southern hemisphere crops in the northern winter. Some traders describe a tendency for a weather premium to build ahead of the US summer and fade into harvest. Seasonal tendencies like this are widely known, often priced in, and frequently fail in the years that matter most. The forthcoming guide to commodity seasonality looks at why seasonal charts are much less reliable than they look.

Worked example: sizing a wheat CFD

The figures below are illustrative, not current prices, and the contract terms are examples. Always check your own provider's specification.

Suppose your provider offers a wheat CFD priced from the CBOT contract with these terms:

• Quote: cents per bushel, for example 550.00 bid / 550.75 ask.
• Contract size: 1,000 bushels per contract.
• Value of a one-cent move: 1,000 × $0.01 = $10 per contract.
• Notional at 550.75 cents: 1,000 × $5.5075 = $5,507.50. At the ESMA maximum of 10:1 for retail clients, the margin is about $550.75.

You have a $15,000 account and accept a 1% risk, or $150. You buy at 550.75 with a stop at 525.75, 25 cents below.

• Loss per contract at the stop: 25 × $10 = $250.
• Position size: $150 ÷ $250 = 0.6 contracts.
• Planned maximum loss: 0.6 × $250 = $150.

Notice the spread: at 0.75 cents, it is worth $7.50 per contract, so you start the trade $4.50 behind on 0.6 contracts. The instruments profit and loss calculator turns moves like this into account currency.

The limit-down scenario

Now suppose a WASDE report surprises with a much larger crop and the underlying futures fall straight to an illustrative limit of 40 cents below the previous settlement, and lock there. Your stop at 525.75 sits inside that range, but there may be no tradable price until the market unlocks or the next session opens. If the CFD next trades at 510.75, the loss is 40 × $10 × 0.6 = $240, 60% more than planned. If you had sized at the maximum leverage instead, say 2.5 contracts on $1,377 of margin, the same move would cost $1,000.

The calculation shows why grain traders often use smaller sizes than the leverage cap permits, and why holding positions through the WASDE release is a deliberate decision rather than an accident. The instruments position size calculator helps you work backwards from your risk to a size.

Grain CFDs in practice

• Availability. Not every CFD provider offers grains, and those that do usually offer only wheat, corn and soybeans, sometimes with limited trading hours.
• Hours. CBOT grains trade on CME Globex in an evening and overnight session and a daytime session, with a break in between, rather than nearly 24 hours like oil or gold. CFD prices follow those hours, so there are more daily gaps than in other markets. Check the hours in your provider's specification and in the instruments market hours tool.
• Spreads. Grain CFD spreads are usually wider, relative to price, than major index or forex spreads, and widen further around reports and at the session open.
• Leverage. Grains count as "other commodities" under ESMA rules, so retail leverage is capped at 10:1. See ESMA leverage limits and negative balance protection.
• Financing and rolls. Rolling grain CFDs carry daily financing and periodic roll adjustments, which can be large when old-crop and new-crop prices differ.

Common mistakes

• Treating grains like forex. Grain prices are driven by crops and weather, not central banks. A strong US jobs report says little about a soybean crop.
• Forgetting the report calendar. WASDE, Prospective Plantings, Acreage and Grain Stocks dates are published months in advance. Holding a large position through them by accident is avoidable.
• Ignoring limit moves. A stop loss cannot be filled in a market that is not trading.
• Mixing up contracts. Chicago soft red winter wheat, Kansas City hard red winter wheat and Euronext milling wheat are different markets with different prices.
• Relying on seasonal charts. Average seasonal patterns hide years with the opposite behaviour.
• Copying lot sizes between providers. A grain CFD of 1,000 bushels and one of 5,000 bushels have very different values per cent.

Most retail CFD accounts lose money, and thinly traded, event-driven markets such as grains can magnify the effect of leverage. The risk warning explains more.

Frequently asked questions

What is the WASDE report?

The World Agricultural Supply and Demand Estimates report is the USDA's monthly forecast of supply, demand and ending stocks for major crops in the US and around the world. It is published at 12:00 New York time, usually between the 8th and 12th of each month, and is the scheduled release that most often moves grain prices.

Why did wheat prices spike in 2022?

Russia's invasion of Ukraine in February 2022 disrupted exports from two of the world's biggest wheat suppliers. Chicago wheat rose by its daily limit for several sessions, reaching $12.94 a bushel on 7 March, a 14-year high. India's export ban in May added a second jump before prices eased later in the year.

What does limit-up or limit-down mean?

CBOT grain futures can only move a set amount from the previous settlement in one session. When price reaches that limit and stays there, the market is locked and trading at other prices stops until the next session or until the price comes back inside the band.

How are wheat and corn prices quoted?

In US cents per bushel. A wheat price of 550 means $5.50 per bushel. The CBOT futures contract covers 5,000 bushels, so a one-cent move is worth $50 per contract. CFD contract sizes differ, so check the value per cent in your provider's specification.

What leverage can I use on grain CFDs?

Retail clients in the EU and UK are limited to 10:1, the cap for commodities other than gold. Given limit moves and report-day gaps, many traders use much lower effective leverage.

Does weather really matter more than economic data?

During the growing season it usually does. A change in rainfall forecasts for the US Midwest, Brazil or the Black Sea region can move grain prices more than most macroeconomic releases, because it changes the expected size of the crop directly.