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Start Learning → Browse All Articles →Calendar spread strategy trading in commodities means taking opposite positions in two futures contracts on the same underlying commodity but with different expiry months, profiting from a change in the price difference between the two contracts rather than from the direction of the commodity’s outright price. This piece works through how a calendar spread is actually structured, why the difference between two expiries moves at all, how inter-commodity spreads extend the same logic across related but distinct commodities, and the practical mechanics of managing a spread position through to expiry.
A standalone futures position is exposed to the full outright price movement of the underlying commodity — if the price rises, a long position gains and a short position loses, in full. A spread position, by contrast, involves being long one contract and short another related contract simultaneously, so that a broad move in the underlying commodity’s price affects both legs in the same direction and largely cancels out.
What remains exposed is only the difference between the two legs, not the overall price level of the commodity. This is the entire appeal of spread trading: it isolates a narrower, often more analysable variable — the relationship between two contracts — rather than requiring a view on where the commodity’s price is headed in absolute terms, which is a considerably harder call to get right consistently.
Because a spread’s value depends on the relationship between two contracts rather than on the absolute price level, it tends to move with less volatility than an outright position of similar size, and it can be structured around a specific, well-understood driver — such as a seasonal storage pattern or a shift in near-term supply — rather than requiring a broad macro view on where the whole commodity complex is heading. This is precisely why spread trading is often described as a more research-driven, less speculative style of participation than taking large outright directional positions.
A calendar spread, also called a time spread, involves buying one expiry of a commodity futures contract and simultaneously selling a different expiry of the same commodity. A trader might go long the nearer-month contract and short a contract expiring several months later, or structure the position the other way around, depending entirely on the view being expressed.
The position profits if the price difference between the two months moves in the anticipated direction, regardless of whether the underlying commodity’s outright price rises or falls over the same period. If a trader is long the near month and short the far month, the position gains when the near-month contract strengthens relative to the far-month contract, and loses if that relationship moves the other way, independent of the commodity’s absolute price trend.
The relationship between near and far month prices is generally described using two terms. Contango describes a market where later-dated contracts trade at a premium to nearer ones, often reflecting the cost of storing a commodity over time. Backwardation describes the opposite — later-dated contracts trading at a discount to nearer ones, often reflecting tight near-term supply relative to expectations further out. A calendar spread is, at its core, a bet on how this contango or backwardation relationship will shift, narrow, or widen.
A spread is typically plotted as its own single series — the price of one leg minus the price of the other — rather than as two overlapping price lines that a trader has to compare visually. Once charted this way, a spread behaves like any other tradeable instrument, with its own support and resistance levels, its own historical range, and its own patterns of expansion and contraction that can be studied on their own terms.
A useful habit when starting to study a particular spread is to look back across several years of that same seasonal window, since many commodity spreads exhibit a recognisable range within which they tend to trade at a comparable point in the calendar, even though the overall level of commodity prices may have changed considerably between those years. This historical range, rather than any single year’s absolute price level, is usually the more relevant reference point for judging whether a current spread reading looks stretched or unremarkable.
Several forces influence how the price difference between two expiries of the same commodity evolves. Storage cost is one of the most fundamental — a commodity that is expensive or difficult to store tends to show a different term structure than one that is cheap and easy to hold in inventory, because the cost of carrying physical stock from one delivery month to the next is embedded in the spread between contracts.
Seasonal patterns in supply and demand also shape the relationship predictably for many commodities, since production, harvest, or consumption cycles recur at roughly the same time each year. A commodity whose supply tightens seasonally ahead of a particular delivery month often shows a recognisable, recurring pattern in its calendar spread around that time of year, which is part of why calendar spreads are a favoured tool among traders who study a specific commodity closely over multiple seasons.
Near-term supply disruptions, changes in expected future supply, and shifts in the interest-rate environment that affects the cost of carrying inventory can all move a calendar spread independently of what is happening to the commodity’s outright price on any given day. This is precisely why a spread trader tends to focus research effort on these specific, narrower drivers rather than on the broader set of factors that move outright commodity prices.
An inter-commodity spread extends the same basic logic across two different but economically related commodities rather than two expiries of the same one. A position might go long one commodity and short another where the two have a historically stable price relationship driven by a shared input, a substitution relationship, or a common end-use industry.
Two commodities that share an underlying economic link — one being an input into producing the other, or both serving overlapping end uses in the same industry — tend to move together over long stretches of time because they are exposed to many of the same broad economic forces. An inter-commodity spread is built on the expectation that this relationship holds most of the time, and that when it temporarily diverges, it eventually reverts toward its more typical range.
The risk in this type of spread is precisely that the relationship can break down for reasons specific to one commodity and not the other — a shift in an input cost affecting one leg specifically, a production disruption unique to one commodity, or a change in regulation affecting one industry but not the other. Unlike a calendar spread on a single commodity, an inter-commodity spread carries a genuine risk that the historical relationship itself has permanently shifted rather than simply diverged temporarily.
Setting up a spread position means simultaneously placing the long leg and the short leg, ideally at close to the same time, so that the entry captures the intended price relationship rather than an accidental one created by legging into the position at two different moments with the underlying price having moved in between.
Position sizing on each leg also needs attention, since the two contracts in a spread do not always represent identical exposure per lot, depending on contract specifications for each commodity or expiry. Getting the ratio wrong can leave a position with residual outright exposure to the commodity’s price level, which defeats the purpose of putting on a spread in the first place rather than an outright directional position. Working out the correct ratio between legs before entering, rather than adjusting after the fact, avoids carrying an unintended directional tilt for however long the mismatch goes unnoticed.
Because the two legs of a well-constructed spread largely offset each other’s directional risk, exchanges typically apply a reduced margin requirement to a recognised spread position compared with holding the same two legs as unrelated outright positions. This lower margin reflects the genuinely lower risk profile of a properly hedged spread relative to two separate directional bets.
This margin benefit is one of the practical reasons spread trading appeals to traders working with a defined amount of capital — the reduced margin allows a given amount of capital to support a spread position of a certain size that would require considerably more capital if the two legs were held as unrelated outright positions instead.
A spread position needs the same discipline as any other position with respect to when it will be closed or rolled forward. As the nearer-month leg of a calendar spread approaches its own expiry, a decision is needed on whether to close the entire spread, or to roll the near leg into a later month to maintain a similar structure without carrying the expiring contract into its final settlement.
Because a spread’s profit and loss depends on the relationship between two contracts rather than a single price, tracking a spread position means watching the spread value itself as the primary metric, rather than watching either leg’s outright price in isolation. Some trading platforms display the spread as a single tradeable quote for exactly this reason, which makes ongoing monitoring considerably more straightforward than manually tracking two separate contracts and calculating the difference by hand each time. A trader who only watches the two outright legs separately can easily lose sight of how the spread itself is actually behaving, especially during a session when both legs are moving quickly in the same direction.
A calendar spread strategy involves buying one expiry of a commodity futures contract and selling a different expiry of the same commodity, profiting from a change in the price difference between the two months rather than from the commodity’s outright price direction.
A calendar spread trades two different expiries of the same commodity, while an inter-commodity spread trades two different but economically related commodities, betting on a shift in the price relationship between them rather than between two expiries of one commodity.
No. A calendar spread is structured so that a broad move in the underlying commodity’s price affects both legs similarly and largely cancels out, leaving exposure primarily to the relationship between the two expiries rather than the outright price level.
Because the two legs of a properly constructed spread largely offset each other’s directional risk, the position carries genuinely lower risk than two unrelated outright positions of the same size, which exchanges reflect through a reduced margin requirement.
The main risk is that the historical price relationship between the two commodities can break down for reasons specific to one commodity and not the other, meaning the relationship may not revert to its typical range the way it is expected to.
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