We tested the 17-20 and 20-25 zones over 22 years. One looks harmless, one looks scary, and neither gives you a real edge.
There is a comforting belief that the VIX level tells you what is coming. Sit in the high teens and the tape feels safe. Climb into the low twenties and people start bracing for a break. There is also a popular variant: if VIX coils inside a narrow band for a while, a violent move is quietly loading, like a spring.
We put both ideas to the test, two ways. First, does simply being in a band predict a spike? Second, does staying in it for many days add anything? We used 22 years of daily VIX and S&P 500 history, defined a "spike" as VIX reaching 30 (and, separately, the S&P falling 5%) over the next 20 trading days, and compared every band against the only benchmark that matters: a randomly chosen day.
| Starting condition | Reached VIX 30+ | S&P fell 5%+ | Median VIX gain |
|---|---|---|---|
| Any random day | 22% | 20% | +23% |
| VIX in 17 to 20 | 12% | 20% | +22% |
| VIX in 20 to 25 | 33% | 30% | +20% |
On the surface this looks like a clean story: the 17 to 20 zone is calm (it reaches 30 less often than a random day), and the 20 to 25 zone is dangerous (it reaches 30 far more often, and the S&P falls 5% half again as often). One harmless, one scary. But only one of those reads survives a second look, and it is not the scary one.
The high-teens zone gives you nothing to trade. The S&P drawdown rate sits exactly on the baseline (20% either way), and the chance VIX reaches 30 is actually lower than a random day, 12% versus 22%. Part of that is simple distance: getting from 18 to 30 is a 50% to 75% jump, a tall order in three weeks. But the deeper point is that 17 to 20 is just a mildly unsettled tape, not a market loading for a launch. It is a comfortable middle. There is no stored energy in it.
The low-twenties zone is the one that looks predictive, and it is the one worth being careful about. Yes, VIX reached 30 a third of the time and the S&P fell 5% in 30% of cases, both well above baseline. But that is the level describing itself, not a hidden forecast, for two reasons.
One: proximity. From 20 to 25 you are already most of the way to 30. Reaching it can be as little as a 20% move, so of course it happens more often than from a tape sitting at 14. The giveaway is the last column: the median VIX gain from 20 to 25 is +20%, which is slightly below the all-day baseline of +23%. You are not getting a bigger spike in this zone. You are just starting closer to the line you are measuring against.
Two: it describes the present, not the future. VIX at 20 to 25 means a stress move is already underway or just happened. Volatility clusters: once it is elevated it tends to stay elevated for a stretch. So "20 to 25 is followed by more drawdowns" really just says "the market is already nervous, and nervous tends to persist a little." That is true, and it is also not an edge, because it is something the VIX number itself already told you. There is no extra information in the band.
"VIX is at 20 to 25" is a statement about now: the market is already unsettled. It is not a peek at next week. The higher spike count that follows is the level being elevated, plus the well-known habit of volatility to cluster, not a band quietly forecasting anything.
Two bands, two questions (being there and staying there), every instance counted, all of it measured against a random-day baseline.
Reaches the VIX 30 spike level less often than a random day (12% vs 22%), with baseline drawdown odds. No edge, and no sign of a coiled spring.
More spikes and drawdowns follow, but that is proximity (already near 30) plus volatility clustering, not a forecast. The band adds nothing the VIX number did not already say.
In percent terms, neither band beats baseline (~20% to 23%). The low-twenties zone actually spikes slightly less in relative terms. The "danger" is absolute distance, not size.
Staying in either band for many days does not reliably raise spike odds, and VIX rarely parks in a tight range long enough to even test the idea.
The other half of the folklore is duration. The claim is that the longer VIX sits inside a band, the more pressure builds, and the bigger the eventual break. If that were true, the spike odds should climb with the length of the stay. They do not.
| Length of stay in the band | 17 to 20: reached VIX 30+ | 20 to 25: reached VIX 30+ |
|---|---|---|
| Any day at the level | 12% | 33% |
| 5+ days straight | 12% | 40% |
| 10+ days straight | 0% | 33% |
The 17 to 20 zone goes flat, then to zero. The 20 to 25 zone shows a small bump at a week (40%), but it evaporates by ten days, falling right back to where it started. There is no clean "the longer it sits, the bigger the break" pattern in either band, and both ten-day columns lean on a tiny 18-case sample. On top of that, the premise is rare to begin with: VIX seldom parks inside a narrow band for weeks, because these are levels it passes through. Sitting still, it turns out, is not stored energy.
Why the scary-looking zone fools people, and what it would take to be a real signal.
The low-twenties zone coincides with more stress because it already is more stress. A description of where the market is right now is not a forecast of where it is going, no matter how alarming it looks in a table.
Reaching VIX 30 is far easier from 25 than from 14. A higher hit rate can be pure distance, not skill. The honest check is the percentage move: by that measure no band beats a coin flip, and the low-twenties zone is actually a touch worse.
The coiled-range idea is intuitive and, here, wrong. Staying inside a band adds no reliable spike odds, and VIX so rarely sits put for long that there is barely a sample to argue with. If volatility is loading, the VIX range is not where it shows.
The shape of the VIX futures curve moves with positioning and forward expectations, not just where spot happens to sit today. See it live in the term structure tool.
Open the VIX Term Structure
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