EducationMarket structure~18 min readUpdated 29 September 2026
The short answer
Forex trades 24 hours a day, but not all 24 hours are equal. Three main sessions overlap during the trading day: Tokyo, London and New York. The two overlaps — Tokyo–London and London–New York — produce the tightest spreads, the deepest liquidity and the largest moves. If you only trade one window, trade the London–New York overlap. The two hours before it — the London open — come a close second.
Why session matters as much as setup
Two identical setups on the same chart, at two different times of day, produce two different outcomes. The Asian session's chop kills setups that would have run cleanly during the London–New York overlap. The reason is mechanical, not mystical. Liquidity is concentrated in the overlap. Spreads are tighter. Algos are more active. Price moves further before reversing.
Session is the first filter, before setup, before entry, before risk. Wrong session, right setup — still a losing trade.
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Written by the Trade To The Top team|Reviewed 29 September 2026
Session times and overlap windows cross-checked against the BIS Triennial Central Bank Survey (2022) for FX turnover by region, the CLS Settlement hourly FX flow data, the London Stock Exchange / New York trading hour conventions, and the standard session templates used by TradingView, MetaTrader and Myfxbook. DST adjustments noted as a general rule. The Tokyo–London overlap duration is approximate and varies with DST.
Every retail trader eventually learns this lesson, usually the hard way. You build a strategy on the London–New York overlap. You start trading it during the Asian session because that is when you are awake. It stops working. The strategy did not break. The session did. This lesson is about making sure that never happens to you.
Key takeaways
Three main sessions: Tokyo (Asian), London (European), New York (American).
Two overlaps: Tokyo–London and London–New York. The latter is the deepest liquidity of the day.
Session times shift with DST. US and European clocks change twice a year, and they change on different dates.
Liquidity determines volatility. The same setup in a thin session produces less movement and more whipsaw.
The London open (07:00–09:00 UTC) is the most important two hours of the day. Most of the daily range is set here.
The London–New York overlap (13:00–17:00 UTC) is the deepest. Tightest spreads, largest moves, cleanest setups.
The Asian session is the setup. The range it produces is often the range that London breaks.
The Friday close and Sunday open are dead zones. Spreads widen. Do not trade them.
Low-liquidity sessions produce fake breakouts. Volume is not there to sustain the move.
Match your strategy to the session it was built for. Do not trade a London strategy in Asia.
Forex has no opening bell and no closing bell. But the underlying banks do. The three main financial centres — Tokyo, London and New York — each have banking hours during which their institutional desks are staffed, their markets are open, and their order flow dominates the tape.
Those three windows are the sessions. They are not rules. They are concentrations of liquidity. When Tokyo's desks are open, JPY pairs move most. When London is open, EUR, GBP and CHF pairs move most. When New York is open, USD pairs dominate.
The session you trade is a filter. It tells you which pairs to look at, when the spread will be tightest, and how much of a move to expect.
The three main sessions
Session
Hours (UTC)
What to trade
Tokyo (Asian)
00:00–09:00 UTC
JPY pairs, AUD and NZD crosses, and the Asian range for other pairs.
London (European)
07:00–16:00 UTC
EUR, GBP, CHF, and all majors. Highest single-session volume.
New York (American)
12:00–21:00 UTC
USD pairs, US indices, gold, oil.
These times shift by one hour twice a year with DST. Europe and the US change clocks on different dates, so there is a two-week window in March and October where the offset between them shifts by an hour. If you trade the London open, check the exact London time, not the UTC hour.
THE 24-HOUR SESSION TIMELINE · UTC
Three main sessions plus the Sydney open · two overlap windows marked
The 24-hour cycle. Three sessions, two overlaps. Times shift with DST — check London time, not UTC.
The two overlaps
An overlap is when two sessions are open at the same time. There are two:
Tokyo · London overlap
Window07:00–09:00 UTC
Duration~2 hours
LiquidityRISING
Best forEUR, GBP
LONDON OPENThe most important two hours
London · New York overlap
Window13:00–17:00 UTC
Duration~4 hours
LiquidityPEAK
Best forAll majors
DEEPESTTightest spreads, cleanest setups
The London–New York overlap is the single most important four-hour window in forex. Roughly half of the daily range on most major pairs is set during this window. Spreads are at their tightest. Algos on both sides of the Atlantic are active. Any breakout that is going to run, runs here.
Why liquidity drives everything
Liquidity is not evenly distributed across the day. It follows the banking centres. And it determines four things at once:
LIQUIDITY AND VOLATILITY BY HOUR · TYPICAL MAJOR PAIR
Relative volume and average hourly range across the 24-hour cycle
Liquidity by hour. Two peaks: London open and New York open. The overlap between them is the deepest window of the day.
Spread. Thicker liquidity = tighter spread. The spread on EURUSD during the London–New York overlap can be 0.1 pip. During the Asian session or the Friday close, it can be 1.5–3 pips.
Range. Higher liquidity = larger candle range. The same pair moves roughly twice as far per hour during the overlap as during the Asian session.
Slippage. More resting orders = less slippage on market orders. Stops triggered during the overlap fill closer to their requested price.
Direction. Higher liquidity = stronger trends. Algos on both sides push in the same direction when the overlap is active. Choppy markets are common in thin sessions.
The London open
The London open is the most important two hours of the trading day. Most of the daily range is set between 07:00 and 09:00 UTC. This is where the day's bias is decided.
Three things happen at the London open:
Overnight orders hit the market. Asian and European desks clear their books and take fresh positions.
The Asian range gets tested. The high or low of the Asian session is swept, often in both directions.
Direction is set. By 09:00 UTC, the daily trend is usually established. By 12:00 UTC, most of the range is done.
This is the Judas swing window from Lesson 20. The London open is where the false move traps retail traders before the real move begins.
THE LONDON OPEN BREAKOUT · CANDLESTICK VIEW
Twenty-two candles · Asian range, London open sweep, breakout
The London open. Asian range set, London sweeps one side, then breaks the other. This is the Judas swing window.
Common mistake
Entering a trade at 06:55 UTC, just before the London open, because the setup looks perfect. You are about to be swept. The first move of the London session is designed to trap early participants. Wait for the sweep to complete, then trade the reclaim of the range.
The New York open
The New York open (12:00 UTC) is the second major liquidity event of the day. It overlaps with the London session from 13:00 to 16:00 UTC — the deepest four hours of the day.
Three things happen at the New York open:
US data drops. Non-farm payrolls, CPI, FOMC decisions, and the bulk of US economic releases land at 12:30 or 13:30 UTC.
The London move is tested. If London ran up all morning, New York often reverses or extends it. If London ranged, New York breaks.
US indices open. The equity cash open at 13:30 UTC drives correlated moves in USDJPY, gold and index CFDs.
The New York open is the second-best window for trend trades, after the London open. If London gives you a clean setup, New York often gives you the continuation.
The Asian range
The Asian session is not the dead zone. It is the setup. The high and low of the Asian session become the reference for the London open. What London sweeps, Tokyo set.
Three characteristics of the Asian session:
Lower volatility. Ranges are typically 30–50% of the London session range.
Tighter for JPY pairs. Tokyo is the primary session for USDJPY, EURJPY, GBPJPY and AUDJPY.
Choppy for everything else. EURUSD and GBPUSD often range for hours during the Asian session.
The Asian session sets the range. London sweeps it. New York extends it.
Match strategy to session
This is the practical rule. Every strategy has a session it was built for. Trading it in the wrong window is like using a screwdriver as a hammer — sometimes it works, but you are fighting the tool.
Strategy type
Best session
Worst session
Range trading
Asian
London–NY overlap
Breakout trading
London open, NY open
Asian, late NY
Trend following
London–NY overlap
Asian midday
News trading
US data windows (12:30, 13:30 UTC)
Asian session
Mean reversion
Asian, late NY
London open
Judas swing setups
London open, NY open
Asian session
Worked example — the same breakout, two sessions
Instrument
EURUSD
Asian range high
1.0855
Breakout level
1.0858
Entry
1.0860
Stop
1.0845
Target
1.0920
Risk
15 pips
Reward
60 pips
R:R
4.00 : 1
Scenario A — Breakout happens at the London open (08:00 UTC).
Deep liquidity. Algos active. Breakout runs clean. Spread 0.2 pips. Slippage minimal.
Target hit at 1.0920. Result: +60 pips, 4.00R winner.
Scenario B — Same breakout happens during the Asian session (04:00 UTC).
Thin liquidity. Spread 1.5 pips. Algos mostly inactive.
Price pierces 1.0858 by 1 pip, then reverses. Stop hit at 1.0845.
Result: −15 pips, 1R loser. Plus 3 pips of spread = roughly −18 pips net.SAME SETUP. DIFFERENT SESSION. DIFFERENT OUTCOME.
When this fails
When this fails
Summer and holiday liquidity. August, late December, and major holidays (Christmas, New Year, Easter) reduce liquidity across all sessions. A London open in August behaves like an average Asian session in October. Reduce size or sit out.
Non-farm payrolls and central bank days. Session boundaries are overridden by the news event. Trade the reaction, not the session pattern.
Cryptocurrency. Crypto trades 24/7 but liquidity follows US and Asian hours differently than forex. The session model transfers only partially.
Fixed session times without DST checks. US and European DST change on different dates. If you are hardcoded to a UTC time, your London open is one hour off twice a year.
If you remember nothing else: the session is the first filter. Before setup. Before entry. Before risk.
In one box
Three main sessions. Tokyo (00:00–09:00 UTC), London (07:00–16:00), New York (12:00–21:00).
Two overlaps. Tokyo–London (07:00–09:00), London–New York (13:00–17:00).
The London–NY overlap is deepest. Tightest spreads, largest ranges, cleanest setups.
The London open is the most important two hours of the day. Most of the daily range is set here.
The Asian range sets the reference. London sweeps it. New York extends it.
Liquidity determines: spread, range, slippage, and direction.
Match strategy to session. Range trading in Asia, breakouts in London, trends in the overlap.
DST shifts twice a year. Check London time, not UTC hour.
Friday close and Sunday open are dead zones. Spreads widen. Do not trade.
Session first, then setup. Wrong session, right setup = still a losing trade.
Log your sessions in R. Our free trading journal lets you tag trades by session — Asian, London, NY, overlap — so you can see which window actually produces your best R-multiples. Most traders discover they should only trade the overlap.
5 questions · immediate feedback · retake any time
Question 01 of 05
When is the London–New York overlap?
Correct: B. The London–New York overlap runs roughly 13:00–17:00 UTC and is the deepest liquidity window of the day. Times shift by an hour with DST.
Question 02 of 05
Why is the London open so important?
Correct: C. The London open (07:00–09:00 UTC) is when the Asian range is swept and the daily direction is set. Most of the day's range is established during this window.
Question 03 of 05
You find a clean breakout setup on EURUSD at 04:00 UTC. What should you do?
Correct: A. Breakouts during the Asian session usually fail because liquidity is thin. The same setup during the London or New York open is worth taking. Wait for the session to change.
Question 04 of 05
What does the Asian session usually produce for the London session?
Correct: D. The Asian range becomes the reference for the London open. London typically sweeps one side of it (the Judas swing) and breaks the other, establishing the daily direction.
Question 05 of 05
What happens to session times when the US and Europe change clocks?
Correct: B. The US and Europe change clocks on different dates (usually about two weeks apart). During those windows, the London and New York sessions shift by an hour in UTC terms. Always check the London clock, not the UTC hour.