The core purpose of the Alligator indicator is to help you decide "when to act," not "which direction to trade." It is built from three smoothed and right-shifted moving averages. When the three lines are tangled together, the market is consolidating. When they open up in a specific order, a trend is starting. This "displacement" design is what sets it apart from ordinary moving average combinations, and it is also the part most often misunderstood.
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Three-Line Displacement: What Each Line Represents
The Alligator indicator was designed by Bill Williams. Its three lines are based on the median price (High + Low ÷ 2). Each line is first smoothed with a moving average and then shifted to the right by a certain number of bars.
| Line | Color | Period | Right Shift | Role |
|---|---|---|---|---|
| Jaw | Blue | 13 | 8 bars | Slowest, represents the longer-term price center |
| Teeth | Red | 8 | 5 bars | Medium speed |
| Lips | Green | 5 | 3 bars | Fastest, close to the current price |
Right shifting means displaying the calculated moving average a few bars to the right. It still uses historical prices and has no predictive power. The purpose of the shift is to make the separation and convergence of the three lines easier to see on the chart. The key is always their relative position and distance from each other.
Trend Entry and Exit: How to Read the Three States
The arrangement of the three lines determines the market condition.
Lines tangled together — sleeping, do not act. When the blue, red, and green lines are crossing and tangled with each other, the market is in a directionless sideways range. Bill Williams called this state "the alligator is sleeping." In this phase, there is no opportunity for trend trading, so you should wait. Some sources note that the market only trends clearly 15% to 30% of the time. The Alligator's job is to filter out the noise during the rest of the time.
Lines open in order — eating, follow the trend. When the three lines separate from the tangle and line up in the order of Lips, Teeth, and Jaw, it signals that a trend is starting. Specifically:
Long signal: The green line (Lips) is on top, the red line (Teeth) is in the middle, and the blue line (Jaw) is at the bottom, with the distance between them widening.
Short signal: The blue line is on top, the red line is in the middle, and the green line is at the bottom, also with widening distance.
Green line turns back — closing mouth, prepare to exit. When you are holding a position and you see the fastest green line start to turn back, or even cross the red line, it means trend momentum is fading and the alligator is "full." This is a reference time to take profit, but it does not mean you should immediately reverse your position.
When the Indicator Fails
The Alligator indicator has clear failure patterns, mainly in choppy markets. In a sideways range, the three lines will cross repeatedly and generate many false signals. Investopedia notes that in range-bound markets, "awakening signals" fail frequently, causing traders to be stopped out again and again.
Another limitation comes from the lag caused by the displacement design itself. All three lines are smoothed and shifted moving averages, so signals are naturally delayed. If you wait for the green line to cross the red line to confirm a trend, that signal is already a "late signal." Williams' original system used fractal breakouts together with the Alligator lines to enter trades, precisely to make up for the indicator's lag with price structure.
Checklist for Judging Whether a Signal Is Usable
When you get an Alligator signal, go through this order:
First, check whether the three lines are separating from a tangled state. If the lines were already in an orderly arrangement and then a new cross appears, that signal is weaker than the first opening signal after a long sleep. The longer the alligator sleeps, the more attention the trend after waking up usually deserves.
Next, check whether the order is correct. For a long trade, you need Green > Red > Blue. For a short trade, you need Blue > Red > Green. If the order is messy, the trend direction is unclear and should not be used as a basis.
Finally, confirm that the candle has closed. During the session, the three lines may cross briefly and then return. Waiting for the candle to close can help filter out some false signals.
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References
- Babypips · Alligator, page published or updated: 2020-04-22; checked: 2026-10-16.
- Titan FX · Alligator Line Complete Guide: Three-Line Structure, Wake-Up Signals and Fractal Entry, page published or updated: 2026-08-17; checked: 2026-10-16.
- Bitget · Avoid Being Whipsawed in Ranges! Alligator Line in Practice: The Ultimate Hunter of Big Trends, page published or updated: 2026-06-15; checked: 2026-10-16.
- Investopedia · Master the Williams Alligator Indicator for Optimal Trading Success, page published or updated: 2015-07-20; checked: 2026-10-16.
- EBC Financial Group · Alligator Line Explained 2025: How to Read Trends and Find Entry Points?, page published or updated: 2025-11-27; checked: 2026-10-16.
- WallStreetMojo · Alligator Indicator - What Is It, Calculation, 5 Limitations, page published or updated: 2025-03-10; checked: 2026-10-16.
- RADEX MARKETS · Master Alligator Indicator Settings for Trend Trading, page published or updated: 2026-09-10; checked: 2026-10-16.
