A Donchian channel plots the highest high and the lowest low over the last N periods as an upper and lower line. A 20-period channel marks the highest high and lowest low of the last 20 bars. When price breaks above the upper line it has made a new 20-bar high - a breakout - and below the lower line a new 20-bar low.
What it measures
There is nothing hidden in a Donchian channel - it is a visual record of the range. The upper and lower lines are objective breakout levels, and the midline is the average of the two. Because it needs no smoothing or settings beyond the lookback period, it is one of the cleanest ways to define a breakout and was the backbone of the original Turtle Traders' trend-following system.
How to read it
Where traders get it wrong
The weakness of any breakout tool is the false break - price pokes above the channel, triggers entries, then falls back inside. In choppy, rangebound markets Donchian breakouts whipsaw badly. They work best in trending conditions and on higher timeframes, and they pair naturally with the breakout strategy and a volatility filter like ATR to avoid trading breaks into dead ranges.
An indicator confirms, it does not command. The signal is a reason to look, not an order to trade. Combine it with levels and the trend, and size every trade with the position size calculator so a false signal costs a small, fixed amount.
Test it before you trust it
Every indicator lags, because it is built from prices that have already printed. Add it to the chart in the simulator, trade the same setup with and without it across a large sample, and keep it only if it genuinely raises your expectancy - not because the signal looks convincing in hindsight.
Donchian Channels FAQ
What are Donchian channels?
Donchian channels are an indicator that plots the highest high and the lowest low over a set number of past bars as two lines, with their average as a midline. A break above the upper line is a new high for the lookback period and a break below the lower line is a new low - making them a simple, objective breakout tool.
How do you trade Donchian channel breakouts?
Enter when price closes beyond the channel - above the upper line for longs, below the lower line for shorts - signalling a new high or low for the lookback period. Breakouts work best in trending markets and on higher timeframes; in ranges they produce false breaks, so a volatility filter and a backtest help separate the real moves.
What is the difference between Donchian and Bollinger Bands?
Donchian channels are built from the actual highest high and lowest low over N bars, so they track the real range. Bollinger Bands are built from a moving average plus a volatility multiple (standard deviation). Donchian is a pure breakout tool, while Bollinger Bands are more often used to gauge volatility and mean reversion.