Donchian Channels are refreshingly simple: the upper band is the highest high over the last N periods, the lower band is the lowest low, and the middle is their average. There's no smoothing, no standard deviation — just the recent range. It's the classic breakout indicator, famously used by the Turtle Traders.

The breakout logic

The idea is pure trend-following: when price makes a new N-period high (breaks the upper channel), a new uptrend may be starting — go long. When it makes a new N-period low, go short. The channel simply marks "have we exceeded the recent range?" — a mechanical, unambiguous breakout signal.

Why simplicity is the point

Donchian's power is its objectivity: there's no interpretation, no lag from smoothing, no debate about parameters beyond the lookback. A new high is a new high. That mechanical clarity is exactly what a systematic strategy wants — a rule that can be applied identically every time, with no discretion. The Turtles proved a simple, consistently-applied breakout rule could work precisely because it removed human judgment.

Donchian Channels don't interpret the market — they just ask one question: did we break the recent range or not?

The trade-off

Breakout systems shine in trends and bleed in ranges — a Donchian breakout in a choppy rectangle is a whipsaw machine, buying every false high and selling every false low. Like all trend tools, it needs a trending regime to earn its keep. Its enduring lesson isn't the indicator itself — it's that a simple rule, applied without exception, beats a complex one applied emotionally.