Bull Flag Pattern
A sharp rally (the pole) followed by a tight, downward-sloping consolidation (the flag). Breaks higher to continue the rally.
Trading rules at a glance
- Entry
- Long on close above the upper flag trendline.
- Stop Loss
- Below the lowest point of the flag.
- Target
- Pole length projected upward from the break point.
How the Bull Flag forms
Pole: sharp vertical move upward on high volume. Flag: tight downward or sideways consolidation on declining volume. The pattern completes when price breaks above the upper flag boundary.
How to trade it
- Identify a strong impulse move (the pole) with wide-range bullish candles.
- Wait for a shallow, tight pullback — deep or wide pullbacks invalidate the flag.
- Enter long on a close above the upper flag trendline.
- Target the same distance as the pole, measured from the breakout.
Common mistakes to avoid
- Trading flags that are too wide — ideally the flag should retrace no more than 38-50% of the pole.
- Missing the pole context and trading random consolidation as flags.
- Using too-tight stops inside the flag.
Real-world example
Bitcoin repeatedly formed textbook bull flags during its 2020-2021 bull market, with each tight pullback resolving to new highs in the direction of the primary uptrend.
Best timeframes
The Bull Flag works best on 15m, 1H, 4H charts. It can appear on lower timeframes but signal reliability drops significantly below the 1-hour chart.
Related patterns
Ascending Triangle
A flat resistance with rising support below. Typically breaks upward in an existing uptrend.
Descending Triangle
Flat support with falling resistance above. Usually breaks downward in a prevailing downtrend.
Bear Flag
Mirror image of a bull flag. Sharp decline (pole) followed by an upward-sloping consolidation (flag). Breaks downward.
Cup and Handle
A rounded base (the cup) followed by a shallow pullback (the handle), then a breakout to new highs. A William O'Neil classic.