VIX Term Structure: Contango vs Backwardation

What Is the VIX Term Structure?

The VIX itself covers one window: the next 30 days. Cboe publishes sister indices for other windows, all built from S&P 500 (SPX) option prices with the same basic method. Put them side by side and you can see whether the market expects the next few weeks to be calmer or rougher than the months after.

All of them are quoted in annualized volatility points, like implied volatility. A VIX of 20 means SPX options are priced for moves of about 20% a year, which works out to a one standard deviation move of roughly 5.8% over a month (20 divided by the square root of 12).

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Two Curves: The VIX Indices and VIX Futures

When traders talk about "the VIX curve" they can mean two different things, and it helps to keep them apart.

The index curve is the set above: VIX9D, VIX, VIX3M, VIX6M. Every point is measured today, from options trading today. It shows how expected volatility changes with the length of the window.

The futures curve is a row of VIX futures contracts, one per month, traded on the Cboe Futures Exchange. Each contract is the market's price today for where the 30-day VIX will be on its settlement morning. A future does not have to equal the VIX before then. The two meet at settlement, when the future settles to a special opening value of the VIX worked out from that morning's SPX option prices.

The two curves usually slope the same way, because they are priced off the same fear. The futures curve matters most if you trade VIX futures, VIX options or VIX funds. The index curve is the quicker read on how worried the market is right now. The Volcademy lesson on VIX futures walks through settlement and roll yield with worked numbers.

Contango vs Backwardation

The curve has two basic shapes.

Contango means the curve slopes up: short windows are priced lower than long ones. VIX9D sits under the VIX, the VIX under VIX3M, near futures under later futures. This is the normal state in calm markets.

Backwardation, also called an inverted curve, means it slopes down: the next few weeks are priced as riskier than the months after. This shows up during sharp selloffs.

Here is one of each. The numbers are made up for illustration, but the shapes are typical.

Why contango is normal. Volatility tends to drift back toward its long-run average, so from a low level the market expects it to rise over time. A longer window also leaves more room for something to go wrong, so sellers of longer-dated protection ask for more. Most of the time, the curve sits in contango.

Why it inverts. In a selloff the fear is about the next few days and weeks. Short-dated options get bid up hard, because that is where hedgers need protection right now. Longer windows rise too, but less, because the market expects the panic to fade. The front of the curve moves much more than the back.

How to Read the Curve

You do not need every point. A few simple comparisons cover most of what traders look at.

One more thing confuses people: the VIX usually sits above the at-the-money implied volatility of SPX options. The VIX formula uses a wide range of strikes, including out-of-the-money puts, which are priced richly because investors buy them as crash insurance. On the afternoon of November 12, 2026, for example, the VIX was 18.82 while 29-day at-the-money SPX implied volatility was 14.7%. Both describe the same market. They just measure it differently.

What an Inversion Has Meant

Inversions are uncommon, and they cluster in the market's worst stretches. The VIX moved above VIX3M during the August 2015 selloff, in February 2018, in late 2018, in March 2020 and in early August 2024. Long stretches of inversion are rarer still: late 2008 and spring 2020 stand out, both tied to a real fear of recession.

A few lessons come up again and again in those episodes.

• It shows stress that is already happening. By the time the VIX is above VIX3M, the selling has usually started. An inversion describes the present. It is a poor early warning.
• Most inversions are short. Many lasted days to a few weeks before the curve went back to contango. When the curve turns back up, it is a sign that near-term fear is easing, not proof that the bottom is in.
• The front can move very fast. On February 5, 2018, the VIX closed at 37.32, up from 17.31 the trading day before. XIV, an exchange-traded note that made money by betting against VIX futures, lost more than 90% of its value and was shut down. On November 5, 2026, the VIX went from 16.61 to 28.18, a 70% jump in one session and the third-largest one-day percentage rise since 1990.
• Short volatility gets hurt most. Positions that collect premium in calm markets, such as short VIX funds, short index strangles and naked puts, take their biggest losses in the weeks when the curve is inverted.

How Traders Use It

As a filter for selling premium. Traders who sell index options, through iron condors, credit spreads or strangles, often check the curve first. Contango is the normal backdrop for collecting premium. An inverted curve says the market is under stress right now, and many sellers cut size, move their strikes further out or wait for the curve to turn back up.

To time hedges. Protection is cheapest when the VIX is low and the curve is in steady contango, which is also when it feels least necessary. Once the curve inverts, short-dated puts cost far more. Hedgers who buy protection in calm periods pay much less than those who buy after the curve has flipped. The portfolio hedging guide covers the structures.

For calendar spreads. A calendar spread sells a near-dated option and buys a later one. When the front of the curve is pushed up by a scheduled event or a selloff, the option you sell is the expensive one. The trade works if the front falls back toward the back. It loses if the stress gets worse and the front keeps climbing, or if the price moves far from the strike.

To understand VIX funds. Funds that hold short-term VIX futures keep selling the near contract and buying the next one. In contango, each future they hold tends to drift down toward the lower VIX as it nears settlement, so the fund loses value in months when the VIX does nothing. In backwardation the roll works in their favor, which is part of why they can jump during a selloff. If you trade these, the futures curve matters more than the VIX itself.

On single stocks. Every optionable stock has its own term structure. The difference is earnings: options that expire just after a report carry the expected earnings move, so a bump at that expiration is normal, not a sign of panic. The term structure lesson covers the single-stock version, and IV crush explains what happens to that bump after the report.

Common Mistakes

• Reading every short-end bump as fear. A VIX9D spike before a Fed meeting is usually the event being priced, not the market breaking.
• Treating an inversion as a crash forecast. It describes a selloff in progress. Plenty of inversions ended within days and the market recovered.
• Calling the gap between VIX futures and the VIX a mispricing. Futures above spot in calm markets is the normal state. It reflects the expected drift back toward average and a premium for selling protection.
• Using a VIX fund's chart as a VIX chart. Funds that hold futures lose value in steady contango, so their long-run charts slope down even when the VIX ends where it started.
• Ignoring the level. A flat curve at 30 and a flat curve at 14 call for very different position sizes.

Checking the Curve on ApexVol

In the Terminal, Market Overview has two tabs for this. Term Structure plots at-the-money implied volatility for the S&P 500, Nasdaq 100 and Dow across their first four monthly expirations, with the slope from the first month to the fourth for each. VIX shows the current level, where it sits in its past year and its last 90 sessions.

ApexVol does not chart VIX9D, VIX3M or VIX futures directly. The S&P 500 curve comes from the same SPX options the VIX indices are built from, so its shape usually tells the same story, at a lower level, because at-the-money options leave out the put skew the VIX counts. For any single stock or ETF, IV Intelligence shows its own term structure, expiration by expiration.