The VIX, the Cboe Volatility Index, measures how much the stock market expects the S&P 500 to move over the next 30 days, as implied by the prices of S&P 500 index options; it is quoted as an annualized percentage [2]. A higher VIX means investors are paying more for protection against large moves, which is why it is called the market's "fear gauge." The VIX closed at 15.21 on October 12, 2026, below its average daily close of 19.42 since 1990; its record close was 82.69 on March 16, 2020 [1].
How is the VIX calculated?
Options give the right to buy or sell the S&P 500 at a set level. Their prices rise when traders expect bigger swings, because a large move makes the options more likely to pay off. Cboe combines the prices of a wide range of S&P 500 options expiring around 30 days ahead into a single number for expected volatility [2].
Two points follow from that design. The VIX is a forecast, not a measure of how much the market has actually moved; FINRA notes that it "is not based on actual price fluctuations" but on expectations implied by option prices [2]. And because it reflects what traders pay for insurance, it usually rises when stocks fall: the VIX has historically been negatively correlated with stocks [2].
What does a VIX level mean in practice?
The VIX is an annualized standard deviation. Dividing by the square root of 12 converts it to a one-month figure, and by the square root of 252 (trading days in a year) to a daily one. A VIX of 15.21, its close on October 12, 2026, implies a typical one-month move in the S&P 500 of about 4.4% up or down, and a typical daily move of about 1.0% [1]. A VIX of 30 implies about 8.7% a month and 1.9% a day.
| VIX close | Share of trading days since 1990 | Typical market mood |
|---|---|---|
| Below 15 | 32.0% | Calm, low expected swings |
| 15 to 20 | 31.1% | Normal |
| 20 to 30 | 29.0% | Elevated worry |
| Above 30 | 7.9% | Stress or crisis |
Source: Cboe VIX daily closes, January 2, 1990 to October 12, 2026 (9,292 trading days); shares are DataPorium calculations [1].
The median close since 1990 is 17.56, lower than the average of 19.42, because a small number of crisis days pull the average up [1]. The lowest close on record was 9.14 on November 3, 2017 [1]. The averages also vary by decade: 18.46 in the 1990s, 22.12 in the 2000s, 16.86 in the 2010s and 20.62 from 2020 through October 2026 [1].
When did the VIX spike?
| Episode | Date | VIX close | Intraday high |
|---|---|---|---|
| Global financial crisis | October 24, 2008 | 79.13 | 89.53 (all-time high) |
| Global financial crisis | November 20, 2008 | 80.86 | 81.48 |
| February 2018 volatility shock | February 5, 2018 | 37.32 (from 17.31, +116% in one day) | 38.80 |
| COVID-19 crash | March 16, 2020 | 82.69 (record close) | 83.56 |
| August 2024 sell-off | August 5, 2024 | 38.57 | 65.73 |
| April 2025 sell-off | April 8, 2025 | 52.33 | 57.52 |
| 2026 high so far | March 27, 2026 | 31.05 | 31.65 |
Source: Cboe VIX daily history [1].
The largest one-day percentage jump on record was on February 5, 2018, when the VIX more than doubled from 17.31 to 37.32 [1]. On August 5, 2024, it touched 65.73 in early trading, then closed at 38.57 and fell to 27.71 the next day, an example of how quickly spikes can fade [1]. In April 2025, it closed at 52.33 on April 8 and at 33.62 on April 9 [1].
What has the VIX done in 2026?
The VIX rose after the war that began with US and Israeli strikes on Iran on February 28, 2026 and disrupted oil shipping through the Strait of Hormuz [3]. It averaged 25.6 in March 2026 and closed at a 2026 high of 31.05 on March 27, then eased through the summer [1]. Even with oil prices high, the VIX averaged 15.8 in September 2026 and closed at 14.21 on September 22, its lowest close of the year to date [1].
| Month (2026) | Average VIX close | Highest close |
|---|---|---|
| January | 16.2 | 20.09 |
| February | 19.2 | 21.77 |
| March | 25.6 | 31.05 |
| April | 19.8 | 25.78 |
| May | 17.2 | 18.43 |
| June | 17.9 | 22.22 |
| July | 17.1 | 20.66 |
| August | 15.2 | 16.50 |
| September | 15.8 | 17.84 |
| October (to the 12th) | 15.4 | 16.39 |
Source: Cboe VIX daily closes; monthly figures are DataPorium calculations [1]. Index levels, sector moves and the day's biggest movers are on the DataPorium stock market page [4].
The VIX is the price of insurance on the S&P 500: it is usually low and steady, jumps when stocks fall sharply, and tends to fall back within days or weeks.
Does a high VIX mean stocks will fall?
Not by itself. The VIX moves with stocks in real time rather than ahead of them; it is high because prices are already falling or swinging. Two tendencies are visible in the history:
- It is mean-reverting. Spikes have faded quickly: from 38.57 to 27.71 in one day in August 2024, and from 52.33 to 33.62 in one day in April 2025 [1].
- Low readings can last. The VIX closed below 15 on 32% of trading days since 1990, often for months at a time [1]. A low VIX says the market expects calm, not that calm is guaranteed; February 2018 began with the VIX near 13 [1].
Can you invest in the VIX?
Not directly. The index itself cannot be bought; exposure comes through VIX futures, options and exchange-traded products linked to futures [2]. FINRA warns that VIX futures do not track the index precisely, that their sensitivity to it weakens for longer maturities, and that volatility-linked exchange-traded products "generally aren't designed to be used as buy-and-hold investments" and can lose much of their value quickly [2]. Leveraged and inverse versions add further risk [2].
Key takeaways
- The VIX measures the S&P 500's expected volatility over 30 days, implied by index option prices [2].
- It has averaged 19.42 since 1990, with a median of 17.56; it closed at 15.21 on October 12, 2026 [1].
- Its record close was 82.69 on March 16, 2020, and its intraday record 89.53 on October 24, 2008 [1].
- In 2026 the VIX peaked at a 31.05 close on March 27 and averaged 15.8 in September [1].
- VIX-linked products track futures, not the index, and FINRA says they are generally not buy-and-hold investments [2].
Frequently asked questions
What is a normal VIX level?
Between about 15 and 20. Since 1990 the VIX has averaged 19.42 and closed between 15 and 20 on 31.1% of trading days [1].
What was the highest VIX ever?
The highest close was 82.69 on March 16, 2020, at the start of the COVID-19 pandemic; the highest intraday level was 89.53 on October 24, 2008 [1].
What does a VIX of 30 mean?
It implies the market expects the S&P 500 to move about 8.7% up or down over the next month, about 1.9% a day. The VIX has closed above 30 on 7.9% of trading days since 1990 [1].
Why is the VIX called the fear index?
Because it usually jumps when stocks fall sharply, as investors pay more for options that protect against losses. It closed at 52.33 on April 8, 2025, during a sharp stock market sell-off [1][2].
Sources & References
- [1] Cboe Global Markets, VIX Index historical daily prices, 1990 to October 12, 2026 (accessed October 13, 2026)
- [2] FINRA, Volatility-Linked Exchange-Traded Products (accessed October 13, 2026)
- [3] International Energy Agency, Oil Market Report - March 2026 (March 12, 2026)
- [4] DataPorium Stock Market (US indexes, movers and sector performance)