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VIX Term Structure Explained

Updated October 14, 2026 · 11 min read

The VIX is often called the market's "fear gauge," but a single VIX number tells only part of the story. The VIX term structure, the set of prices for volatility at different horizons, shows whether the market expects stress to fade, persist or get worse.

1. What the VIX measures

The Cboe Volatility Index (VIX) estimates the volatility that the S&P 500 options market expects over the next 30 calendar days. It is calculated from the prices of a wide range of SPX puts and calls, interpolated to a constant 30-day horizon, and it is quoted in annualized percentage points. A VIX of 20 implies an expected annualized move of about 20%, or very roughly 20 ÷ √12 ≈ 5.8% over the next month.

Because it is derived from option prices, the VIX reflects both expected movement and the price investors are willing to pay for protection. It tends to rise when stocks fall, since demand for puts surges during sell-offs.

2. VIX futures and why they differ from spot

The VIX index itself cannot be bought or sold. To trade volatility, investors use VIX futures (ticker VX), which are cash-settled to a special opening calculation of the VIX on their expiration morning. Monthly VIX futures usually expire on a Wednesday, 30 days before the following month's standard S&P 500 options expiration.

A VIX future is therefore a bet on what the VIX will be on a specific future date, not on today's VIX. If the VIX is 25 today but the market expects calm to return, the future expiring in three months may trade well below 25. If the VIX is 12 and the market expects some volatility to return, longer-dated futures may trade above 12. The difference between futures and spot is the market's forecast plus a risk premium.

3. Contango and backwardation

Contango means each successive future is priced higher than the one before, so the curve slopes upward. This is the normal state of the VIX market, seen most of the time. When markets are calm, short-term volatility is low, but investors still pay a premium for protection further out, because a shock could happen at any time and volatility tends to revert toward its long-run average.

Backwardation means near-term futures are priced above longer-term ones, so the curve slopes downward. It usually appears during sell-offs, when immediate fear is high and the market expects volatility to calm down eventually. Deep backwardation has historically coincided with acute market stress, while a return to contango has often accompanied stabilization.

The steepness matters too. A steep contango, with the second month several percent above the first, signals complacency or a strong expectation of calm. A flat curve suggests the market is uncertain whether stress is building or fading.

4. The VIX index family

Cboe publishes several volatility indices that apply the VIX methodology to different horizons. Plotting them together gives a second view of the term structure that does not depend on futures:

The VVIX measures the expected volatility of the VIX itself, derived from VIX options. A high VVIX means traders expect large swings in volatility, which often happens around turning points.

5. Ratios traders watch

• VIX / VIX3M: below 1 means the one-month expectation is under the three-month expectation, a normal upward-sloping structure. A ratio above 1 indicates inversion and is widely watched as a stress signal.
• M1 to M2 contango: the percentage difference between the first and second monthly futures. It summarizes the front of the futures curve in one number and drives the cost of rolling long volatility positions.
• Spot versus M1: if the front future is below the VIX index, the market expects volatility to fall by expiration; if above, it expects volatility to rise or stay elevated.

6. Why the curve matters for VIX products

Exchange-traded products that offer long volatility exposure typically hold a rolling position in short-dated VIX futures. In contango, they continually sell cheaper near-term futures and buy more expensive later ones, and as each future drifts down toward spot over time, the product loses value. This roll cost is why long volatility products tend to decline over long periods even when the VIX itself ends up roughly where it started.

In backwardation the effect reverses, and rolling can add to returns. Understanding the shape of the curve is therefore essential before using any volatility product.

7. Reading the VIX page on this site

• Header shows the VIX, a contango or backwardation badge based on spot versus the front month, the first two futures, M1 to M2 contango, the VIX / VIX3M ratio and the VVIX.
• VIX futures curve plots the current price of each monthly future against days to expiration, with the latest settlement prices as a dashed reference line and the spot VIX as a horizontal guide. Comparing the two lines shows how the curve has shifted since the last settlement.
• VIX index term structure plots VIX1D through VIX1Y, with the previous close dashed for comparison.
• Month-over-month contango bars show the percentage step between each pair of adjacent contracts. Green bars mean the later contract is more expensive; red bars mean it is cheaper.
• Futures table lists each contract's expiration, days remaining, price, change, step versus the prior month and open interest.

8. Limitations

• Quotes are delayed, and thinly traded back-month futures can show stale prices, especially outside regular hours.
• Only monthly futures are shown; weekly VIX futures are excluded.
• The VIX measures expected volatility implied by option prices, which includes a risk premium. It is not a direct forecast of realized volatility, and implied volatility has historically tended to exceed the volatility that actually follows.

Continue with How to Read Gamma Exposure or Reading the Implied Volatility Surface.