TL;DRThe opening range breakout (ORB) strategy defines the high and low of the first 15 or 30 minutes of regular trading hours, then enters a trade when price breaks above or below that range. It works because the opening range captures the first wave of institutional activity, and a clean break often signals the session's direction. Best on days with a narrow opening range relative to recent averages.
The opening range breakout is one of the oldest and most straightforward trading strategies. The concept is simple: let the market establish a range in the first minutes of any session, then trade the first clean break of that range.
The logic behind it is sound. The beginning of any session brings a surge of order flow. Large funds execute positions, orders get filled, and the market digests recent news. The range that forms during this initial period reflects the consensus between buyers and sellers at that moment.
When price breaks out of this range with conviction, it suggests one side has won the opening battle. The breakout often leads to a sustained move as trapped traders on the wrong side exit and momentum traders pile on.
While ORB is traditionally associated with the US RTH open (8:30 AM CT for equity index futures), the same concept applies to any session open. Traders increasingly apply ORB to the London open (~2:00 AM CT), the Asia open (~5:00 PM CT), or even the start of the overnight Globex session. The key is defining a clear opening period for whatever session you're trading.
Define the opening range. Mark the high and low of the first 15 minutes (aggressive) or 30 minutes (conservative) after your chosen session opens. For US equity index futures, the traditional ORB uses the RTH open at 8:30 AM CT. For London session ORB, use the 2:00-3:00 AM CT window. For any session, the principle is the same: mark the range of the first defined period.
Wait for a breakout. A valid breakout is a close of a 1-minute or 5-minute candle above the opening range high (for longs) or below the opening range low (for shorts). A wick poking above isn't enough. You want a clean close beyond the level.
Entry. Enter on the breakout candle close or on a pullback to the broken level. Breakout entries are faster but more aggressive. Pullback entries offer better risk-reward but you may miss the move if price doesn't pull back.
Stop loss. Place your stop on the opposite side of the opening range. If you're long on a break above the OR high, your stop goes below the OR low. This gives you a clear invalidation: if price returns to the opposite end of the range, the breakout failed.
Profit target. A common target is 1x the opening range width projected from the breakout point. If the OR is 10 points on ES and price breaks above at 5,210, the target is 5,220. More aggressive targets use 1.5x or 2x the range width.
Opening range width matters more than anything else. Compare today's OR to the average OR of the past 10-20 sessions (for the same session you're trading). A narrow OR (bottom 25% of recent averages) produces higher-probability breakouts because the market hasn't committed to a direction yet. A wide OR (top 25%) often means the session's move has already happened.
Session context adds information. During the London session, watch how price reacted to Asia's range. During RTH, check the overnight range and any gaps. Each session builds on the prior one, and breakouts that align with the broader directional context have higher follow-through.
Volume on the breakout candle should be above average for that session. A breakout on thin volume is more likely to fail. Note that volume thresholds are different for each session. Overnight breakouts will have lower absolute volume than RTH breakouts, so compare to the session's own average.
Avoid trading ORB around major scheduled events if the event occurs during or shortly after your opening range period. The range is less meaningful when the real catalyst comes later.
ORB works best on trend days. When the market has directional conviction (strong overnight move, clear catalyst, narrow opening range), the breakout often leads to a sustained multi-hour trend. These are the home run days for ORB traders.
ORB works well on days following tight consolidation. If ES has been in a narrow range for 2-3 days, the ORB on the day the range breaks tends to be powerful.
ORB fails on choppy, range-bound days. If the market is directionless, price will break above the OR high, reverse to the OR low, break below that, and reverse again. This creates a series of false breakouts that trigger stops in both directions.
ORB fails when the opening range is wide. A 30-point OR on ES means your stop (from OR high to OR low) is 30 points ($1,500 per contract). The risk-reward doesn't work unless you expect a 60+ point move, which is unusual on most days.
RTH example on ES. ES opens at 8:30 AM CT. In the first 15 minutes, it trades between 5,195 and 5,205. The opening range is 10 points. The 20-day average OR is 16 points, so today's is narrow. The market gapped up 8 points from yesterday's close.
At 8:47 AM, a 5-minute candle closes at 5,206.50, above the OR high of 5,205. Volume on the breakout candle is 40% above average.
Entry: buy at 5,207 (just above the breakout close). Stop: 5,194 (below the OR low, 13 points risk, $650 per contract). Target: 5,217 (1x OR width projected from OR high). Risk-reward is approximately 1:0.77, which is tight. Alternative target at 1.5x range: 5,220, giving 1:1.15 risk-reward.
London session example on ES. At 2:00 AM CT, the London session begins. ES has been drifting in a tight range during Asia. The London OR (2:00-2:30 AM) is 5,188-5,193, just 5 points. At 2:35 AM, ES breaks below 5,188 on a pickup in volume as European traders enter.
Entry: short at 5,187. Stop: 5,194 (above OR high, 7 points). Target: 5,182 (1x range). ES drops to 5,178 by 4:00 AM as the London session develops a downtrend. The narrow London OR signaled that the overnight balance was about to break, and the European session provided the directional catalyst.
Trading every opening range breakout without checking OR width
Narrow ORs produce the best breakouts. If the OR is already wider than the average daily range, there's no edge in the breakout. Compare to the 10-20 day average OR before entering.
Entering before the breakout candle closes
A wick above the OR high is not a breakout. Wait for a candle to close beyond the level. Premature entries get caught in false breakouts regularly.
Using a tight stop inside the opening range
The invalidation level is the opposite side of the OR. If your stop is inside the range, normal noise will stop you out before the real move develops.