The London–New York Overlap
The overlap is the few hours when London is still working and New York has opened. By volume it is the densest period of the day, and almost all significant American data lands inside it.
When the overlap happens
Roughly 13:00 to 17:00 UTC. The boundaries shift with daylight saving, and because Europe and the United States change clocks on different dates, twice a year there are weeks with a non-standard overlap. The window itself is short: about four hours out of twenty-four.
Why liquidity peaks
During these hours participants from the two largest centres are active simultaneously. More participants means more opposing orders, which means a tighter spread and less slippage. This is the period when the market comes closest to the textbook ideal: an order fills at roughly the price you saw.
Why the period is nonetheless risky
The bulk of American statistics is released precisely in this window. High liquidity holds right up to the publication and vanishes in the first seconds afterwards: market makers widen spreads and execution deteriorates exactly when the move is strongest. It is a mistake to assume that active hours always mean good execution — they mean good execution between events, not during them.
How to work the window
It is practical to separate two regimes. Between releases it is the best period of the day for entries: tight spread and real movement. In the minutes before and immediately after a release, positions are either reduced or not opened at all. The dividing line is the economic calendar, not the clock.
This material is educational and is not individual investment advice. Trading forex carries the risk of losing capital.
Frequently asked questions
When is the London and New York overlap?
Roughly 13:00 to 17:00 UTC. Exact boundaries shift with daylight saving changes, which happen on different dates in Europe and the United States.
Why is the spread tightest then?
Because participants from the two largest centres are active at the same time and opposing orders are most plentiful. But the spread stays tight only between releases — it widens at the moment data is published.
Should a beginner trade this period?
The execution is convenient, but the bulk of American data lands in it. It is sensible to trade between releases and avoid opening positions immediately before data.
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