The opening range breakout (ORB) is one of the oldest and most-studied day trading strategies: mark the high and low of the session's first minutes, then trade the break of that range. The logic is simple — the open concentrates overnight orders and fresh decisions, and the first directional escape from that battle often sets the tone for the session.

It's also one of the most backtestable strategies ever devised: fixed time, fixed levels, mechanical trigger. Perfect first project for replay backtesting.

Defining the opening range

• Stocks/futures: the first 5, 15 or 30 minutes after the exchange open (15m is the common default)
• Crypto: markets run 24/7, so use the daily open (00:00 UTC) or the New York / London session opens — the volume influx at those times creates the same dynamic; test which behaves best on your pair

Mark the high and low of that window. That's your range; everything else is waiting.

The strategy rules (15-minute ORB)

• Timeframe: 1m–5m candles for execution
• Setup: let the first 15 minutes complete; draw the range high/low
• Entry (long): a candle closes above the range high → enter
• Stop-loss: the middle of the opening range (aggressive) or the opposite side (conservative)
• Target 1: the range's height projected above the breakout — take partials
• Runner: trail the rest below VWAP or the 9 EMA for trend days
• Short: mirror on a break below the range low
• One re-entry maximum — if the second attempt fails too, the day is rotational; stop

Filters that improve raw ORB

1. Range size sanity check: a huge opening range (news candle) leaves poor R:R — skip; a microscopic range breaks trivially both ways — demand a wider stop or skip.
2. VWAP agreement: longs are stronger when the breakout happens above VWAP with VWAP rising.
3. Higher-timeframe location: an ORB long straight into a major daily resistance level is fighting a wall.

The fade variant

On balanced days, the first breakout often fails and returns to the range — and the failed ORB is its own setup: when price breaks out, cannot extend, and closes back inside the range, enter in the opposite direction targeting the other side of the range. Trend traders take the breakout; fade traders take its failure. Backtest both on the same replayed sessions and you'll see they profit from different day types — which is the real lesson of ORB.

How to backtest it

1. Open chart replay on 5m candles; treat each replayed day as one session using the daily open.
2. Mark the opening range, trade the rules, log the outcome — each session takes minutes, so a 50-session sample builds fast.
3. Tag every session trend day or range day. Your stats will show ORB's true nature: it loses small on range days and wins big on trend days. The strategy survives on that asymmetry.

Common mistakes

1. Entering on a wick-through instead of a close — the open is stop-hunt hour.
2. Trading every day identically — after two failed breaks, stop; it's a rotational day.
3. Full exit at target 1 — ORB's math depends on trend-day runners; always keep a piece.
4. Oversizing because the stop is tight — tight stops mean more stop-outs, not free money; keep risk at 1%.

FAQ

What is the best opening range period — 5, 15 or 30 minutes?

15 minutes is the standard compromise: 5m gives earlier but noisier signals, 30m fewer but more reliable ranges. In crypto, test the daily open vs. the New York open. The differences are real but market-specific — replay 50 sessions of each.

Does ORB work for crypto?

Yes, anchored to the daily or session opens where volume concentrates. Crypto ORB behaves best on volatile majors; quiet weekend sessions are the "range day" failure mode.

What win rate does ORB have?

Commonly 40–55% depending on filters — profitable via trend-day runners that return 2–4R. If you cut runners short, ORB stops working; the exit style is the edge.