Session overlaps are the windows when two major forex trading sessions are simultaneously open — producing the highest liquidity, tightest spreads, and largest directional moves of the trading day. Understanding exactly when these windows occur and which pairs they affect is one of the most practical scheduling decisions a forex trader can make.
- The London/New York overlap (8 AM–12 PM EST) captures roughly 57% of daily forex volume and 50–60 of EUR/USD’s average 80–100 pip daily range.
- EUR/USD ATR during the London/NY overlap averages 30–50 pips versus just 10–15 pips during the Asian session — a 3x difference that directly affects stop placement and R:R math.
- Journaling trades by session tag reveals whether your edge is time-of-day dependent — a variable most retail traders never isolate.
How Session Overlaps Work
The forex market runs 24 hours a day, five days a week — but “open” does not mean “liquid.” Liquidity varies by a factor of 10 or more between peak and trough hours. Three overlap windows concentrate that liquidity:
Sydney/Tokyo overlap — midnight to 2 AM EST (7:00–9:00 UTC). The lowest-volume overlap of the three. Price action is typically range-compressed. AUD/JPY and NZD/JPY see their best liquidity here, but directional moves are limited.
Tokyo/London overlap — 3 AM to 4 AM EST (8:00–9:00 UTC). Only a single hour, but it matters. London desks open and frequently take positions against the Asian session’s established range, triggering sharp moves in USD/JPY and EUR/JPY. This is one of the most consistently volatile one-hour windows of the day despite its modest volume.
London/New York overlap — 8 AM to 12 PM EST (13:00–17:00 UTC). This is the only window that genuinely warrants the label “high volume.” According to the BIS Triennial Survey 2022, London accounts for approximately 38% of global forex turnover and New York accounts for approximately 19% — their combined activity during the overlap concentrates an estimated 57% of daily volume into four hours. EUR/USD, GBP/USD, and USD/CHF are the primary beneficiaries.
The practical consequence of this concentration: EUR/USD spreads on ECN brokers compress to 0.1–0.3 pips during peak overlap hours compared to 0.5–1.5 pips during off-hours. For a scalper taking 10 trades a day at 0.1 lots, that spread differential represents a meaningful shift in daily breakeven cost.
Practical Example
A retail trader based in the Philippines (UTC+8) wants to focus on EUR/USD. The London/New York overlap runs 8 AM–12 PM EST — which translates to 9 PM–1 AM Manila time. That schedule is difficult to sustain consistently.
The Tokyo/London overlap at 3–4 AM EST is 4–5 PM Manila — far more accessible. After tagging every trade by session in PipJournal for 60 trading days, the trader reviews their data and finds a win rate of 58% during the Tokyo/London overlap versus 41% during the late Asian session (11 PM–3 AM Manila). The difference is not strategy — it is session liquidity. The trader restructures their schedule around the 4–5 PM window and eliminates late-night trading entirely.
That single data point from a journal reshapes an entire trading schedule.
Session overlaps are the windows when two major forex markets are open at the same time. The London and New York overlap from 8 AM to noon Eastern Time is the busiest period of the trading day, with the tightest spreads and largest price moves for EUR/USD and GBP/USD.
Common Mistakes
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Treating all trading hours as equal. The forex market being “open” 24 hours is a technical fact, not a trading advantage. A strategy that works in the London/New York overlap may fail in thin Asian hours because the same pip move requires a very different set of market participants to execute.
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Ignoring session timing on prop firm challenges. FTMO, FundedNext, and similar firms apply daily drawdown limits that reset each day. Traders who push positions during illiquid off-hours risk stop-outs at wide spreads, eating into their loss limit before the real trading day begins. Many challenge failures are not strategy failures — they are scheduling failures.
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Assuming the London open equals the London/New York overlap. The London session opens at 8 AM GMT (3 AM EST). The overlap does not start until New York opens at 8 AM EST. Those are different events with different characteristics. The London open alone can produce sharp moves, but the overlap produces sustained trend continuation.
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Never auditing session performance. A breakout strategy that triggers at the London open may underperform when the same pattern appears at 10 PM EST. Without session tags in a trading journal, these performance differences are invisible — the data looks like noise when it is actually structure.
How PipJournal Tracks Session Overlaps
PipJournal automatically tags each trade with the trading session active at entry time, allowing traders to filter performance metrics by session window. The session performance report shows win rate, average R, and profit factor broken down by Asian, London, New York, and overlap windows — making it straightforward to identify whether an edge is session-dependent. Traders preparing for prop firm challenges can use this data to define which hours they should and should not be trading before the challenge clock starts.
