Technical Analysis · Intermediate · 5 min
The opening range
You can mark the opening range of a trading day, explain why the first minutes are often the most active and how traders use a break of the range.
The first half hour
For many markets, the first half hour of the trading day is the busiest. Overnight news meets the market, orders that waited since the previous close are filled, and prices can swing widely in minutes.
Many day traders deliberately do nothing during that time. They wait, mark the highest and lowest price of the first minutes, and then watch which side breaks. That simple routine has a name.
First high, first low
The opening range is the high and the low of the first part of a trading session. Traders choose the window: the first 5, 15, 30 or 60 minutes are common. The idea was popularized by Toby Crabel's 1990 book on opening range breakouts.
Why the first minutes matter:
- Concentrated orders. News and events that happened while the market was closed are priced in at once. As the SEC's bulletin on extended-hours trading notes, much news arrives outside regular trading hours.
- High volume. The opening auction and the first trades often carry the day's heaviest volume.
- First agreement. The range shows where buyers and sellers first found prices they would trade at.
How traders read it:
- A close above the range is often read as buyers taking the lead for the day.
- A close below the range as sellers taking the lead.
- A return inside the range after a break suggests the breakout failed, which some traders read as a sign in the opposite direction.
The opening range is a frame of reference, not a forecast. Many days break out of it in one direction and then reverse. Its value is that it gives clear, objective levels on a day when nothing else on the intraday chart has formed yet.
Out of the range
The fictional chart shows one trading day in five-minute candles.
- Opening range: the first six candles, 30 minutes, run from 99.93 to 100.98. The first candle trades 5,920 shares, about 2.5 times a normal candle later in the day.
- Inside the range: for the next 14 candles, more than an hour, every candle closes inside the range.
- Breakout: candle 21 closes at 101.40, above 100.98, on 5,620 shares.
- Follow-through: the price climbs to 102.84 by the end of the chart.
A trader trading the breakout would have a natural stop inside the range, for example back below its middle near 100.45, since a close back inside would show the breakout failing. The size of the range also gives a sense of the day's early volatility.
Common mistakes
- Trading during the opening swings. The range forms first; many traders wait.
- Changing the window after the fact. Choose 15, 30 or 60 minutes in advance.
- Ignoring failed breakouts. A close back inside the range is information too.
- Using it in thin markets. In markets without a clear open, the concept means less.
The takeaway
The opening range is the high and low of the first minutes of a session. Traders watch for a break out of it, which can set the tone for the day, or fail.
Check yourself
Quick quiz
4 questions. Instant feedback, nothing is saved.
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1Tap the candle that closed above the opening range.
Tap the chart.
Candle 21 closed at 101.40, above the opening range high of 100.98, on 5,620 shares, the second-highest volume after the open.
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2What is the opening range?
Traders choose the window: 5, 15, 30 or 60 minutes are common. Here it is 30 minutes, six five-minute candles.
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3Why is the opening often so active?
Overnight news, pre-market orders and the opening auction all concentrate activity in the first minutes. Here, the first candle traded about 2.5 times a normal candle's volume.
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4A price breaks above the opening range and falls back inside within two candles. What is that?
Opening range breakouts fail often. The lesson on fakeouts applies here too.
of 4 correct.
Sources
- Toby Crabel: Day Trading with Short Term Price Patterns and Opening Range Breakout (1990, book)
- U.S. SEC, Investor.gov: Extended-Hours Trading (Investor Bulletin)