Aroon Indicator Explained: Timing Trend Births

Most trend indicators measure how far price has moved. The Aroon indicator ("dawn's early light" in Sanskrit) measures how recently the extremes happened — which is why it often spots a new trend at its birth rather than halfway through.

How Aroon Works

Two lines, each scaled 0–100 (default period 25):

• Aroon Up: how recently the highest high of the period occurred. A fresh high = 100; no new high for the whole period = 0.
• Aroon Down: the same for the lowest low.

Readings tell a simple story:

• Aroon Up near 100, Down near 0: strong, fresh uptrend.
• Both drifting in the middle: no new extremes — consolidation.
• Up crossing above Down: highs are now more recent than lows — a potential new uptrend.

How to Trade It

1. Crossover entries. Long when Aroon Up crosses above Aroon Down, especially after a long consolidation where both sat low.

2. Trend strength gate. Require Aroon Up above 70 to hold longs; a decay below 50 means no new highs for half the period — the trend is stale.

3. Consolidation detector. Both lines below 50 flags a coiling market — arm your breakout logic instead of trend logic.

Building It in Setup.Cash

Add Aroon in the strategy builder and condition on the Up/Down lines or their crossover. It complements ADX well: ADX measures trend strength, Aroon measures trend freshness — demanding both filters out old, tired trends.

Tuning

• Period 25: the standard.
• Shorter (14): catches trends earlier with more false starts.
• Longer (50): only major trends register.

Related Reading

Aroon's cousin in the extended library is the Vortex Indicator — see also our Vortex guide. As always, backtest the crossover with and without a volatility filter before going live.