Futures Session Structure: Globex, RTH, and How ES and NQ Trade Around the Clock

An ES chart set to the full session blends overnight trading and the cash-hours session into one series, so the same day can show two different highs, two different lows and two different volume pictures depending on which session template you use. If you don't know which session your levels came from, you don't know what they mean.

The Clock

Equity index futures such as ES and NQ typically trade on CME Globex Sunday to Friday, 5:00 PM to 4:00 PM CT, with a daily maintenance break of about an hour. Holiday schedules, early closes and product-specific hours differ, so check the CME holiday and product calendar instead of assuming a normal day. The regular US equity cash session runs 9:30 AM to 4:00 PM ET (8:30 AM to 3:00 PM CT), also with holiday exceptions. Always label the timezone when you write down a time.

Treat the table as a starting point. If you trade from another timezone, daylight saving changes can shift the offset for a few weeks a year.

Overnight High, Low and the Gap

The overnight high (ONH) and overnight low (ONL) are the extremes between the start of the evening session and the 9:30 AM ET open. Pick one start time and keep it. If one chart starts the overnight window at 6:00 PM ET and another at midnight, you'll be comparing different numbers.

The gap is the difference between the RTH open and the prior RTH close. A hypothetical example: the prior cash-session close was 5,000.00 and the RTH open prints at 5,012.50. That is a 12.5 point gap, or 50 ticks. On one ES contract at $50 per point, that is $625 of price distance. The same 12.5 points on one MES is $62.50. The dollar figure matters because it tells you how much room a stop has before the open even trades.

Reading a Gap Without Predicting It

A gap tells you where price starts, not where it goes. Three situations are worth asking questions about, and none of them has a guaranteed answer:

• The open is just under or at a prior day high. Does price accept above that level, or reject it?
• The open is in an area with little prior trade. Price may move through it quickly, in either direction, so wait for the first reaction before assuming one.
• The open is below prior support. Does the level get reclaimed, or does it turn into resistance?

Gaps sometimes fill and sometimes don't. I'd measure that on your own session data instead of relying on any rule of thumb.

The Opening Print and KPL

The first print of the regular session is the anchor for KPL, the fixed reference prices YMI publishes for ES and NQ. The standard map has four levels built from full-session and after-hours travel, and they don't move intraday after the open. Since the anchor is the opening print, no one has completed anchored levels before 9:30 AM ET. Before the open you can mark the overnight high and low and the prior day's levels, and add KPL once the open prints. The KPL trading page covers the construction in more detail.

The First Half Hour

The opening range is the high and low of the first 30 minutes of RTH. Opening range breakout rules use it as a reference, and you can build a rule set on it, but nothing here shows that those breakouts work. If you test it, record every trade with entry, exit, fees and slippage assumptions, and keep out-of-sample days separate. Expect spreads to widen and price to jump around the open, and remember that a stop order becomes a market order when triggered, so it can fill past your price.

Check Time-of-Day Volume on Your Own Data

People often describe a busy open, a quiet midday and a busier close. Verify it for the contract and period you trade:

1. Pull 30-minute volume bars for ES or NQ over the last 20 to 40 sessions.
2. Use one session template (RTH only) for every day.
3. Average the volume for each 30-minute slot.
4. Compare slots as a percent of the day's total.

That gives you a volume profile by time, specific to your instrument and recent regime. If midday volume really is lower, you can decide whether a midday trade is worth taking given a wider effective spread. If it isn't, you've avoided building rules around an assumption.

Scheduled Releases and Which Session They Hit

Several major US data releases are scheduled for 8:30 AM ET, which falls in the Globex session before the cash open. The FOMC statement is typically at 2:00 PM ET, inside RTH. Check the calendar for each event instead of assuming a time, and decide in advance whether you'll hold a position through it. Spreads can widen and fills can slip around scheduled releases, so a stop order does not guarantee your exit price.