The London session opens with a surge of volume that often sets the tone for the entire trading day. The London breakout strategy is built to capture that initial expansion — and it's one of the few setups simple enough to trade mechanically, yet robust enough to survive backtesting.
This guide gives you the exact rules: when to mark the range, what triggers the entry, where the stop and target go, and how to validate it all on historical data before going live.
Why the London session matters
London is the largest FX trading center in the world. When it opens (around 08:00 London time), liquidity explodes. The hours before — the late Asian session — are usually quiet and range-bound. That contrast is the entire edge: a tight pre-London range, followed by an explosive directional move.
The strategy works best on the major pairs that London actually trades: EURUSD, GBPUSD, EURGBP, GBPJPY. Avoid exotic pairs with low liquidity.
The exact rules
Step 1 — Mark the Asian range
Define the range using the late Asian session. A common, robust window is 00:00 to 07:00 UTC. Mark the highest high and lowest low of that window. These two horizontal lines are your breakout levels.
Step 2 — Wait for the London open
From 07:00 UTC onward, watch for price to break either side of the range with a candle closing beyond the level — not just a wick. A wick through the level that closes back inside is a fakeout, not a breakout.
Step 3 — Entry
- Long: a candle closes above the Asian high → enter on the close (or on a small retest of the broken level).
- Short: a candle closes below the Asian low → enter on the close (or on the retest).
Step 4 — Stop loss
Place the stop on the opposite side of the range, or at the midpoint of the range for a tighter stop. The midpoint stop improves risk:reward but increases the chance of getting stopped on a whipsaw — test both on your data.
Step 5 — Take profit
- TP1: a fixed multiple of the range height (e.g. 1× the Asian range). Take partials.
- TP2: the previous day's high/low or the next major liquidity level.
The single biggest filter: only take the breakout in the direction of the higher-timeframe trend or the daily bias. Counter-trend London breakouts fail far more often.
Filters that improve the edge
- Range size filter: skip days where the Asian range is unusually large (the move may already be done) or unusually small (low volatility, choppy).
- News filter: high-impact news at the London open (e.g. UK CPI, ECB) can cause violent fakeouts. Either avoid them or expect wider stops.
- Day-of-week: Mondays are often choppy, Fridays unwind. Many traders find Tuesday–Thursday the cleanest. Backtest to confirm for your pair.
- Retest entry: waiting for a retest of the broken level filters out many fakeouts at the cost of missing the fastest moves.
How to backtest it properly
- Choose one pair (start with EURUSD) and the 15m timeframe.
- Replay the market bar by bar so you cannot see the breakout before it happens.
- Each day, mark the Asian range (00:00–07:00 UTC).
- From 07:00 UTC, take the first valid close-beyond-range entry.
- Apply your stop and target rules exactly — no discretion.
- Log entry, stop, target, result, range size and day of week.
- After 60–100 sessions, analyze: win rate, average RR, best day of week, best range-size bucket.
The data will tell you which filters actually matter for your pair. Most traders discover that 2–3 simple filters (trend alignment, range-size, skip news days) turn a break-even system into a profitable one.
Common mistakes
- Entering on wicks. Require a candle close beyond the level.
- Trading every day. The best London breakouts happen on ~40-50% of days. Filters cut the bad ones.
- Ignoring the daily trend. Counter-trend breakouts are the biggest losers.
- Stops too tight. A midpoint stop is fine only if your data supports it.
- No sample size. You need 60+ sessions to trust the numbers.
In summary
- Mark the Asian range (00:00–07:00 UTC)
- Enter on a candle close beyond the range after 07:00 UTC
- Stop on the opposite side (or midpoint), target 1× range then liquidity
- Filter by trend, range size and news
- Backtest 60+ sessions before trading live
The London breakout is mechanical enough to remove emotion and robust enough to backtest cleanly. That combination makes it one of the best strategies for a trader learning to trade by rules rather than by feel.