What Do Bollinger Bands Show Strategically?
The middle band is typically a twenty-period simple moving average; upper and lower bands sit two standard deviations away. Band width reflects volatility—narrow bands signal compression; wide bands signal expansion. Price touching the upper band shows relative strength within the lookback; touching the lower band shows relative weakness. Bands are adaptive, widening in volatile markets and tightening in quiet ones. Strategies divide into mean reversion at extremes in ranges, breakout trading after squeezes, and trend following when price walks along an outer band. The indicator describes context; rules define trades.
Band touches are not automatic reversals—strong trends ride the upper or lower band for extended periods.
How Do You Trade Bollinger Band Mean Reversion?
In range-bound markets, buy when price closes outside the lower band then re-enters, especially near horizontal support. Short when price closes above upper band then falls back inside at resistance. Confirm with RSI divergence or declining volume on the extension. Stop beyond the band pierce extreme; target the middle band or opposite band depending on range width. Skip mean reversion when ADX rises and bands slope directionally—walking the band is active. Require two-bar confirmation: pierce outside, then close back inside.
Mean reversion fails when fundamentals reprice the stock—bands widen but price does not return to mean quickly.
How Do You Trade the Bollinger Band Squeeze?
A squeeze occurs when band width reaches multi-week lows—volatility contraction often precedes expansion. Enter in breakout direction when price closes outside a band after squeeze with volume above average. Stop on opposite side of the middle band or below breakout bar low. Target a multiple of band width added from breakout—traders often use one to two times the width at squeeze onset. False breaks happen—exit on close back inside bands after a marginal pierce. Combine squeeze with horizontal pattern break for higher conviction.
Not every narrow band guarantees imminent explosion—some squeezes resolve in continued drift with repeated small losses.
When Should You Walk the Bands in a Trend?
In strong uptrends, price hugging the upper band with middle band rising supports pullback buys to the middle or lower band—not shorts at upper band. Downtrends mirror with lower band walks. Enter on touch of middle band holding as support with stop below middle or recent swing. Exit when price closes below middle band in longs or when band slope flattens. Walking strategies suit momentum leaders after earnings gaps or sector rotation. Fading upper band touches in these names is a common losing habit.
Middle band slope is your trend filter—flat middle band means range tactics, not walk-the-band tactics.
What Risk Rules Apply to Band Strategies?
Size positions from stop distance to band pierce or middle band violation. Reduce size when band width is extreme—stops are naturally wider. Track win rate separately for squeeze, mean reversion, and walk setups—they behave differently. After three consecutive mean-reversion stops, assume trend regime and switch playbook. Backtest band parameters on your universe; twenty and two is default, not universal law. Bands work when regime classification precedes signal selection.
Journal band width percentile at entry—knowing you faded a band during a volatility breakout explains outcomes clearly.