Trendline Breakout Strategy: Entry, Stop and Exit, Step by Step

A trendline breakout strategy trades the moment price closes through a trendline: a close above a falling line that joins lower highs is a buy signal, a close below a rising line that joins higher lows is a sell signal. The idea is that the trend the line described is over. ChartSchool puts it this way for a down trendline: as long as prices remain below it, the downtrend is intact, and a break above it means a trend change "could be imminent". Could be: a break is a warning, not a guarantee, so the strategy is only as good as its stop and its exit.

The rules, step by step

1. Find the swing points with a rule. Here, a swing high is a bar whose high is above the highs of the 10 bars before and the 10 bars after it; a swing low is the reverse. The rule has a delay: a swing point is known 10 bars after it forms.
2. Draw the line through two of them. For a down trendline, from the highest swing high of the chart to the later swing high that gives the flattest line with no later swing high above it; for an up trendline, the same with the lows. ChartSchool notes that two points draw a line and a third confirms it.
3. Wait for a close beyond the line. An intraday poke through the line is not a break; the close is.
4. Enter at the next open. You only know the close is beyond the line once the bar is over. A more patient variant waits for price to come back and test the broken line from the other side: the stop can be closer, but the breaks that never come back are missed.
5. Put the stop beyond the breakout bar. Below its low for a long trade, above its high for a short.
6. Exit on a rule set in advance. Here, at the close 20 sessions after the breakout, unless the stop is hit first. A target, such as a prior swing or a measured move, is another choice; what matters is to decide before the trade.

Example 1: the S&P 500 ETF, April 2025

On the daily S&P 500 ETF (dividend-adjusted prices), the rule draws a down trendline through the swing highs of February 19, 2025 (601.41) and March 25, 2025 (567.00). The ETF fell to a low on April 7, then rallied back toward the line.

• Signal: on April 24, 2025, the ETF closed at 537.77, above the line at 536.90.
• Entry: the next open, April 25, at 537.73.
• Stop: under the low of the breakout bar, 526.71, 2.0% below the entry.
• What followed: the lowest low over the next 20 sessions was 532.68 on April 30, above the stop. The close stayed above the line every day.
• Exit: at the close 20 sessions after the breakout, May 22, 2025, at 573.58: a gain of 6.7% before costs, more than three times the risk taken.

Example 2: Bitcoin, November 2025

On daily Bitcoin, the rule draws an up trendline through the swing lows of June 22, 2025 (98,200) and October 10, 2025 (102,000).

• Signal: on November 4, 2025, Bitcoin closed at 101,497.22, below the line at 102,863.64.
• Entry (short): the next open, November 5, at 101,497.23.
• Stop: above the high of the breakout bar, 107,299.00, 5.7% above the entry.
• What followed: the price did not leave the line. It closed back above it on November 5, below on November 6, above on November 7, below on November 8, above on November 9 and 10. On November 11 the high reached 107,500.00 and hit the stop, for a loss of 5.7% on the short: (101,497.23 − 107,299.00) / 101,497.23.
• And then: the same day Bitcoin closed back below the line, and it did not close above it again in the window. It fell to a low of 80,600 on November 21. Twenty sessions after the breakout, on November 24, it closed at 88,300.01, 13.0% below the breakout close.

What makes a trendline break more or less reliable

• Touches. ChartSchool calls a line valid after a third touch; a line through two points is only a hypothesis.
• Slope. ChartSchool warns that the steeper the line, the less meaningful the support or resistance, and that trading the break of a steep line is difficult.
• Scale. Over long periods, a line on a logarithmic chart breaks at a different date from the same line on a linear chart.
• Volume. Some traders want the breakout bar on heavy volume. Our two examples show why that rule needs its own test: the winning S&P 500 ETF break of April 24, 2025 came on 0.59 times its 20-session average volume, an average still swollen by the selloff of early April, while the losing Bitcoin break of November 4, 2025 came on 2.47 times its 20-day average, in our series from one exchange. A volume filter would have skipped the winner and taken the loser.
• Confirmation by levels. ChartSchool suggests checking a break against horizontal support and resistance or the sequence of peaks and troughs.

A trendline break is one kind of breakout, and it has the same failure mode: a close beyond the line followed by a close back inside within a few sessions, the bull trap or bear trap. Other tools of technical analysis can serve as filters, but we have not measured trendline breaks on our bench: the two examples above illustrate the rules, they do not show that the strategy works. The chart patterns built from two converging trendlines are measured; the method is described in how we test patterns.