Old-Crop vs New-Crop Spread in Grain Futures

The old-crop vs new-crop spread is the price difference between grain futures expiring before the upcoming harvest and those expiring after harvest, reflecting the market’s assessment of storage costs, supply continuity, and production risk.

Why the Spread Exists

When a grain harvest is weeks or months away, the market must price two distinct realities: the value of grain now (old-crop, from storage) and the value of grain later (new-crop, assumed freshly harvested).

The spread between these two futures prices encodes the cost of carry: the expense of storing grain from now through the new-crop delivery. This includes:

• Physical storage fees: Elevator or warehouse rent, typically 2–5 cents per bushel per month.
• Financing cost: Interest on the working capital tied up in grain inventory.
• Shrinkage and spoilage: Grain loses weight and quality over months; insects, moisture, and mold take their toll.
• Insurance and handling: Fumigation, transportation between facilities, quality monitoring.

On top of carry costs sits risk premium. Before harvest, nobody knows if the new crop will be abundant or scarce. Bad weather, disease, pests, or geopolitical disruption can reduce yields. This production uncertainty adds a buffer to the new-crop price—a “insurance premium” that compresses only after yields are confirmed.

Anatomy of the Spread: A Worked Example

Scenario: Mid-July, 8 weeks before the corn harvest begins.

The old-crop vs new-crop spread here is September − December = $0.30/bu (or 30 cents/bu, quoted as “30 wide”).

This 30-cent spread reflects:

• Storage and carry: ~10–12 cents for 3 months of elevator fees and financing.
• Risk premium: ~18–20 cents for yield uncertainty and potential supply disruption.

The May contract is 43 cents below September because it’s a new-crop contract delivered even farther into the future, requiring five months of carry plus the baseline new-crop discount.

Before Harvest: Spread Widens

In the weeks leading up to harvest, the old-crop vs new-crop spread often widens, sometimes dramatically. This happens because:

1. Supply grows visible: As harvest approaches, USDA crop reports, satellite imagery, and farmer surveys narrow the range of possible yields. The risk premium shrinks because uncertainty is resolving.
2. Panic buying before harvest: Some participants fear a poor crop or delayed harvest and bid up old-crop futures to secure grain before new supply arrives. Old-crop prices rise.
3. New-crop selling pressure: Other traders, confident in the new harvest, sell forward and lock in a price. New-crop futures fall or stay flat.
4. Structural short squeeze: Old-crop holders who want to exit must sell, but demand is firm, so the price stays elevated relative to new-crop.

A spread that was 20 cents in early September might widen to 50–60 cents by late October, right before combines roll. Traders who recognized the pattern of widening carry and bought old-crop while selling new-crop capture this widening as a profit.

After Harvest: Spread Tightens

Once harvest is underway and yields become observable:

1. Risk premium collapses: Producers know their yield; processors know what they harvested. The unknown is now known. New-crop futures rally sharply as the risk premium evaporates.
2. Old-crop becomes scarce and expensive: As farmers deliver new grain to elevators, old-crop holdings shrink. The last bushels of old-crop are premium; the spread inverts or narrows to near-zero.
3. The curve re-establishes: By December or January, the forward curve is re-anchored. The new “old-crop” is December, and new-crop becomes March, May, and July. A fresh spread emerges.

Spread Dynamics and Trading

Traders exploit old-crop vs new-crop moves in several ways:

Outright speculation: Buy the spread (long old-crop, short new-crop) if you believe the harvest will be poor and risk premium will persist or widen. Sell the spread if you believe the harvest will be large and premium will collapse.

Basis management: Farmers use the spread to decide when to sell. If the new-crop is offered at a large discount to old-crop, a farmer might forward-contract new grain early, locking in a price before harvest. If the spread tightens unexpectedly, that forward contract becomes valuable protection.

Carry arbitrage: Grain merchants and elevators monitor the spread against their actual carrying costs. If the spread is 15 cents but carry costs only 8 cents, buying old-crop and rolling it forward (or storing physical grain) is profitable. If the spread is 5 cents but carry costs 10 cents, they should not own grain and should limit their long exposure.

Commodity curve trades: Sophisticated traders construct multi-leg spread trades, such as “buy the Sep/Dec, sell the Dec/Mar” to express a view on how the entire forward curve will shift as harvest approaches.

Crop Reports and Spread Spikes

USDA crop reports trigger sharp spread moves. The monthly reports, released in the middle of each month during the growing season, provide:

• Acreage planted and progress of crops (percentage emerged, flowering, in grain).
• Condition ratings (percentage in excellent, good, fair, poor condition).
• Yield forecasts for the season.

A report showing significantly worse-than-expected conditions will widen the spread (old-crop rallies, new-crop sells off). A report showing better-than-expected conditions will tighten the spread. Some traders live for these 15-minute windows: the 12:00 EDT release time is heavily traded as positioning shifts on the new information.

Seasonal Patterns and Structural Factors

Over decades of data, old-crop vs new-crop spreads follow broad seasonal and structural patterns:

• Widest: Late September through early November (peak uncertainty, harvest imminent).
• Tightest: Late November through January (harvest complete, new crop delivered, risk dissipated).
• Baseline carry: 10–15 cents/bu in normal years; 30–50 cents in years of extreme tightness or concern.

Factors that widen spreads historically:

• USDA downgrades crop ratings.
• Adverse weather (drought, flooding, late frost).
• Supply disruption (border closures, shipping delays).
• Competing commodity weakness (weakness in soy or wheat that pulls grain export demand).

Factors that tighten spreads:

• Strong export demand (large sales to China or other importers announced).
• Harvest begins early and yields exceed estimates.
• Dollar weakness (makes US grain cheaper for foreign buyers, supporting new-crop prices).

Spread Behavior Across Grain Markets

The old-crop vs new-crop dynamic varies slightly across grain types:

Corn (December harvest, CBOT): The December vs. March spread is the most liquid. Dec contracts often settle by Thanksgiving; the physical flow is rapid. By January, carry considerations normalize and the spread reflects the normal forward curve.

Soybeans (November harvest, CBOT): The November vs. January spread is the action. Soy harvest is faster than corn, so the spread tightens more sharply. New-crop selling by farmers is more concentrated, creating potential spikes.

Wheat (July harvest, CBOT): Wheat is a spring-planted or fall-planted crop depending on type. The July vs. September spread is dynamic but less widely traded than corn/soy. Winter wheat harvest is earlier (June–July) and the curve re-establishes quickly.

See also