Opening Range (ORB) explained

Volatility

What Opening Range (ORB) measures

Marks the high and low of the first few candles after a set moment in the day — by default the first 3 candles after the market opens. The upper band (ORB High) is the highest high of those candles, the lower band (ORB Low) the lowest low, and ORB Mid sits halfway between. The bands appear once the range is complete and stay flat until the next anchor, so the rest of the day can be read against them. It is built for intraday charts, above all 5-minute ones: on daily bars each day is a single candle, so no range forms and the bands stay empty.

How Opening Range (ORB) readings are interpreted

The opening range is the ground the market covered while it settled after the anchor. A close above ORB High means price has left that ground upwards; a close below ORB Low, downwards — the opening range breakout. Between the bands price is still inside the opening range. The width of the range says how much the market moved in its first minutes, which is often read as the day's early volatility.

Conventional Opening Range (ORB) levels

Close above ORB High: the classic upside opening range breakout
Close below ORB Low: the downside breakout
Close back inside the range after a breakout: the breakout has failed, at least for now
Settings: Candles is how many candles form the range (3 on a 5-minute chart = the first 15 minutes; 6 = 30 minutes); Anchor is the market open (09:30 New York for US stocks), midnight, or a time of day you choose; for crypto, which never closes, the open is midnight UTC

Where Opening Range (ORB) works, and where it does not

Designed for intraday trading — most useful on 5-minute bars, and still usable on hourly ones. On daily bars it has nothing to show. The bands only exist once the range is complete: while the first candles are still forming there is nothing to break, so the indicator never looks ahead.

Indicators commonly read alongside Opening Range (ORB)

Volume: a breakout on rising volume is usually read as stronger than one on thin volume
VWAP: a breakout that also holds above (or below) VWAP is a common confirmation
ATR: the range's width compared with ATR shows whether the opening was unusually quiet or unusually wide
Several ranges at once: add ORB as a custom signal as many times as you like — for example 3 candles from the open and 12 candles from the open — and use each in the same strategy

Known limitations of Opening Range (ORB)

A narrow opening range breaks easily, so on quiet mornings breakouts can come early and fail often
On a stock with little trading, 5-minute bars built from one exchange's trades (IEX, which is what a Tiingo key supplies) can miss the opening extremes; measured on 60 sessions, such a stock's IEX opening range was narrower than the full market's on most days, so breakouts on it come earlier than on the whole tape
The anchor time follows the market's own clock (New York for US stocks, UTC for crypto), not your local time

Opening Range (ORB) in practice

Start with the standard setup: 3 candles from the market open on a 5-minute chart
Write the breakout as Close above ORB High — the bands never include the candle being tested, so the rule can fire. Avoid 'crosses above': the bands are empty until the range is complete, so the first candle after it can never register a crossover
To try once a day, add AND NOT an Entry latch (Timing, next trading day) to the buy
Pair it with an exit — the opposite band, ORB Mid, or a time-based exit — since a breakout alone says nothing about where to leave
Test on liquid stocks first; the opening range of thinly traded names is the least reliable part of intraday data

Other volatility indicators

Elder Ray
Mass Index
Ulcer Index
ATR — Average True Range

On the test bench

Does the Opening Range Breakout Actually Work?
One 15-minute opening range breakout rule on 149 large US stocks over six months of 5-minute candles: the result per trade, as a portfolio, at four trading costs, and its strongest and weakest stocks.

Does Gap and Go Work? The Opening Range Breakout on Gap Days
Gap and go tested on 149 US stocks over six months: ORB trades on gap-up, flat and gap-down days, and whether the breakout added anything to the gap.

Does the Price Feed Change a Backtest?
One ORB rule on SPY run on two platforms’ 5-minute data: why backtest results change with the price feed, and how to separate the rule from the data.

Opening Range Breakout (ORB) Studies
The opening range breakout explained — how the range is set, entries, stops, targets and the common variants — with our backtests of it on large US stocks after trading costs.

Testing ideas built on Opening Range (ORB)

A reading of Opening Range (ORB) can be written as an exact rule and checked against historical data — as a full strategy with entries, exits and costs, or as a single condition and what followed it:

How to backtest a trading strategy without code
Event analysis: what follows a market event

Plot it yourself. Add this indicator to a chart, change every parameter and watch the line move, then backtest how the rule would have behaved on historical data — free on the S&P 500 ETF, no card.

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This is reference material, not advice. It describes what each indicator measures and how its readings are conventionally interpreted. Nothing here is a recommendation to buy or sell anything, and no indicator predicts future prices. GU Analyser is an analytical tool — no money is ever traded here.