Contango is a futures term structure in which progressively deferred contract months trade at higher prices than nearer-dated months, producing an upward-sloping curve. It is the opposite of backwardation. In looser market usage, a particular futures contract may also be described as being in contango when it trades above the contemporaneous spot or cash price of the underlying asset. That spot-versus-futures comparison describes one maturity relative to the cash market; it does not by itself establish the shape of the full futures curve. In either usage, contango describes relative prices observed now across different delivery dates, not a forecast that the future spot price must rise.
Carry, inventory and the shape of the curve
In storable, physically deliverable commodities, contango often reflects the economics of carrying inventory through time. Financing, storage, insurance and other carrying costs tend to raise the price required for later delivery, while the economic benefit of having physical inventory available — convenience yield — works in the opposite direction. Ample inventory or weak near-term scarcity can therefore be consistent with contango, but the curve is not determined by storage costs alone: expectations, financing conditions, logistical constraints and deliverability can also affect calendar spreads.
A practically important distinction is that visible contango does not automatically create a profitable storage trade. A cash-and-carry opportunity requires the deferred premium to exceed the relevant financing, storage, insurance, transaction and delivery-related costs, and the asset must actually be storable and deliverable on the required terms. When those conditions are met, the curve can reward carrying inventory forward; when storage capacity is scarce or operational constraints bind, the same quoted spread may be insufficient.
What contango means for a futures position
For a trader maintaining long futures exposure by rolling through successive contracts, contango is commonly associated with negative roll yield. The economic effect comes from holding contracts whose prices may decline relative to the cash market as they approach expiration, not from the roll transaction being a guaranteed standalone loss. Realized futures returns depend on how spot prices and the entire curve move while the position is held, so price appreciation can offset negative roll effects and the curve can change or invert. Convergence of a particular futures contract toward its relevant cash or settlement reference also does not require the entire futures curve to flatten.
The mechanism differs across markets. In equity-index futures, for example, theoretical futures value reflects the cash index, financing costs and expected dividends rather than physical storage. Contango is therefore a term-structure condition, not a universal signal of oversupply, bearishness or future price direction.