Not all trading hours are equal, and treating every hour of the 24-hour FX session as functionally the same is a common early mistake. Liquidity, spread, and volatility all shift meaningfully depending on which major sessions are active — and for spread-sensitive strategies, that difference matters as much as the setup itself.
The London/New York Overlap
The window where the London and New York sessions run concurrently is, for most major and cross pairs, the period of deepest liquidity and typically the tightest spreads of the trading day. It's also, unsurprisingly, when a large share of the day's volume and range gets established — which cuts both ways: better execution, but often faster and larger moves to manage.
Why This Matters More for Some Strategies Than Others
A scalping or spread-sensitive strategy is far more exposed to session timing than a longer-term swing position, where a few extra pips of spread on entry is a rounding error against a much larger target. If your strategy has a tight profit target relative to typical spread, session timing isn't a minor optimization — it's a core part of the edge.
- Spread-sensitive strategies should concentrate activity in the overlap window where possible
- Wider spreads outside the overlap aren't a broker issue — they reflect genuinely thinner interbank liquidity at those hours
- Exotic and lower-volume pairs are affected by session timing even more dramatically than majors
- Check your specific instrument's typical spread by hour before assuming the overlap advantage applies equally everywhere
